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AIBU?

Share your dilemmas and get honest opinions from other Mumsnetters.

New guy I’m seeing had a fling with someone much younger

353 replies

Sroia · 05/05/2025 21:46

I’m 28. I’ve been seeing a guy who is 32. We’re both professionals in London.

We only very recently made it official. I was getting quite excited - bf is very handsome, kind and charismatic. We have shared interests and he’s an amazing cook.

But I found out over the BH weekend (through a gf of bf’s friend) that bf had a fling with a girl who was 20 around Xmas time. It’s really made me feel weird about bf. I would feel motherly towards a 20 yo guy, not want to get with one.

I guess it just indicates he was comfortable with that power imbalance. It seems a bit gross. I have a brother who is 31 and I know he would never date anyone as young as 20.

I'm not overthinking this one, am I?

OP posts:
Fluffypotatoe123987 · 06/05/2025 11:36

Maybe look deeper here. Your jealous of him seeing someone younger. Better body care free etc. Your wanting security and are worried he will run of with someone younger. Has this happened before. Work on your jealousy

Bridestone · 06/05/2025 11:37

SerialChillers · 06/05/2025 11:31

There’s something seriously wrong with a 47 year old who would have sex with a teenager, no matter what you want to tell yourself about it.

His motivation wasn’t, and isn’t, my responsibility. I was working abroad, living independently — sexually inexperienced, sure, but mature in other ways, and well used to looking after myself. I’m not trying to retrofit agency onto a situation where I had none. Obviously I don’t know any more than the OP has disclosed about the 20 year old she’s talking about, but my 18 year old self was pretty hard-headed.

x2boys · 06/05/2025 11:38

HuffleMyPuffle · 06/05/2025 11:33

And here we are, infantalising 20 years olds as "barely legal", "still children", "immature" and then wonder why young adults can't cope alone...

I'm 32, lots of people at my work are 20-25. Some of them are very immature 20 year olds and seem very young, some are 25 but I'd assume were 20, some are 20 but I assumed they were older until they said something about their age. Most of them don't believe I'm over 30.

It entirely depends on the person

Well.exactly it doesn't help young adults to shield them.from the realities of life
My niece lost her mum suddenly when she was just 18 and was deemed adult enough to.have full residency of her two younger brothers and
And yet,on here 20 year olds are all immature overgrown children who can't possibly know their own minds

bluedelphinium · 06/05/2025 11:38

Fluffypotatoe123987 · 06/05/2025 11:36

Maybe look deeper here. Your jealous of him seeing someone younger. Better body care free etc. Your wanting security and are worried he will run of with someone younger. Has this happened before. Work on your jealousy

Is that your idea of looking deeper? 'you're jealous'?

cardibach · 06/05/2025 11:40

NeedToChangeName · 06/05/2025 08:45

Age difference wouldn't bother me too much

Power imbalance more of an issue

Lots of people are saying this, but she was a summer intern and the fling was Christmas time - she wasn’t the intern when it started. There may well have been no power issue at all, just 2 people who had fancied each other when at work but left pursuing it until they didn’t work together.

TheRubyPoet · 06/05/2025 11:41

Fluffypotatoe123987 · 06/05/2025 11:36

Maybe look deeper here. Your jealous of him seeing someone younger. Better body care free etc. Your wanting security and are worried he will run of with someone younger. Has this happened before. Work on your jealousy

Pathetic. It's never about jealousy or being bitter. That's what paedos call women.

Cosyblankets · 06/05/2025 11:43

What does around 20 mean? Was she 20? 21? 22?
My first husband and I had a 10 year age gap. Around those ages No issues whatsoever.

cardibach · 06/05/2025 11:48

unfold1 · 06/05/2025 09:58

^this!! Definitely makes it more inappropriate as she was an intern at his company. I wouldn’t see him in the same way after finding out

I would rarely even cross paths with 20 year olds outside of family, or work interns and I’m not even in my 30s yet - there is a huge difference in life experience. Perhaps will be a few exceptions of mature 20 year olds but even if she was one of them, she was still an intern at his company

I completely agree with you OP and most of my friends would too (late twenties londoner).

I presume the people saying there’s not much of a difference, or how they were mature at 20 or whatever are more likely to be from previous generations. Age gaps were definitely more common in my Mum’s generation and shrugged off but less so now. Also, it’s less about the actual age gap but more the fact she was 20 and an intern

I know these two met at work, but I’m 60 and meet a lot of people in their early 20s through hobbies (music - age doesn’t affect your ability much!). Most of them seem fairly capable. It’s a weird thing of modern society that we don’t meet people from different generations much I think.
In this case they met at work but weren’t working together when the fling happened, judging by the time line in the OP.

cardibach · 06/05/2025 11:51

TheRubyPoet · 06/05/2025 11:18

The women who said youre BU dont understand the power dynamics inherent in men choosing to date far younger. Feminism fails to critically analyse why women should tolerate this.
Women are foolish for accepting that men prefer younger and accepting it. Young women are easily manipulated by an older man with a car who buys them drinks and tells they're mature for their age.
I'm bored shirtless of being told I'm jealous and controlling for wanting to discuss this with men.

I don’t think it’s particularly feminist to say young women are foolish and can be bought with drinks…
Power dynamics are relevant, of course, but not for every single older man/younger woman relationship.

cardibach · 06/05/2025 11:53

SerialChillers · 06/05/2025 11:22

Really disappointing to see so many posters defending predatory behaviour of men in their 30s towards women who are barely out of their teens.

Trying to derail the conversation based on the OP making a flippant and clearly joking comment about her younger self is just silly.

This man preyed upon a very young woman who was still a student and doing an internship at his place of work. Totally inappropriate behaviour and clearly it raises serious questions about his values.

I don’t think anyone is defending predatory men, more saying there’s no real evidence this was predatory. They weren’t actually working together when it happened if the OP’s timeline is right and he doesn’t seem to have a pattern of going with much younger women - he’s seeing the OP, for example.

Lassango · 06/05/2025 11:58

"I guess it just indicates he was comfortable with that power imbalance"

You are overthinking things.

Why do you assume there was a 'power imbalance'? Perhaps they both wanted some sex and both agreed.

BestDIL · 06/05/2025 11:59

Sroia · 05/05/2025 22:41

Elder sisterly then.

I would not be wanting to get with a 20 yo. That’s for damn sure

I am 8 years older than my husband. We have been married for 22 years - NOBODY thought it weird that I was dating someone 8 years younger than myself. There was 13 years between my parents and NOBODY thought that weird either.

Get a grip OP. Unless he was involved with her at the same time as you, why are you bothered by it!

MoominMai · 06/05/2025 12:00

MyOtherCarIsAPorsche · 06/05/2025 00:41

You look at your 20 year old self as a foetus? That's a really strange thing to say. I'm offended if I'm totally honest.

I had a joint mortgage with my partner at 19 who I married at 20. We've been together 40 years. I certainly didn't feel like a foetus when I got married.

Our youngest daughter met her partner at work when she was 20 and he was 34. He couldn't believe it when her office was decorated with 21st birthday balloons for her - he thought she looked late 20s. She thought he looked late 20s. They've been together 9 years, lived together 7 years, married one year, and have three children. Both have professional careers.

I think if your boyfriend elicits such strong adverse feelings in you then you're obviously not meant to be together - especially since he seems to like younger women than you.

Yes but your daughters OH as yiu said didn’t know her age. What OP is saying is her DP knowing she was a 20year old intern in for the summer made a move. Sorry but I find that predatory and icky. As I said in an earlier post, I’ve worked around this age group for same reason and as I look way younger than I am had a 20 year old come onto me as a 34 year old. Sorry but at that age they are literally like kids still when you yourself are early 30s. Imagine the judgment on a 34 year old woman if she had a 20 year old boyfriend. So gotta agree with the OP, it’s weird. In the end I laughed it off with the intern and did feel protective like OP of this age group rather than see them as potential mates! 🤢

unfold1 · 06/05/2025 12:02

MyOtherCarIsAPorsche · 06/05/2025 11:00

@unfold

what is more strange actually is OP being a foetus at 20 and motherly at 28! And she uses words such 'literally' to emphasise that.

generation has absolutely nothing to do with it whatsoever

so you want it both ways?

what about legal age of consent/smoking/voting are you saying that 20 years olds aren't capable of this now because you're all in the foetus state still at 20?

you don't know what you want

Not sure why you are still taking the light hearted comments about foetus and motherly so seriously
I already mentioned fetus is a known jokey term to describe your younger self, like internet slang, especially used in stan twitter.

people often use ‘literally’ or other terms when they don’t actually mean it

for eg “I’m dying” when they’re not actually dying

and bit of a reach with your last point… 💀

Don’t thinks 20 years olds are actually fetus state, but I do still think most 20 year olds today have different life experience to 30 year olds (especially if they’re a student still like this case).

Someone2025 · 06/05/2025 12:08

Sroia · 06/05/2025 11:14

And I also said I misspoke with the “motherly” comment. I was trying to convey how I have absolute no sexual interest in the 20 yos at my workplace due to the fact they seem very young.

It’s different for men

JustAnInchident · 06/05/2025 12:11

I have to say, I couldn’t find it in me to get worked up about this. They obviously had something in common and found each other mutually attractive or they’d not have got to the dating stage. They then discovered they were incompatible, perhaps due to the age difference, and called it a day. No harm, no foul, imo.

orangedream · 06/05/2025 12:15

It would give me the ick.

NPET · 06/05/2025 12:17

I've said YABU,
BUT I can understand your feelings. I'm 21 and the oldest guy I've ever dated was 25 (I was 19 and thgt I was being A BIG GIRL!), so it does seem a little weird. But if it happened be4 you were exclusive and it's all over, I don't think it should concern you.
Thinking about it, a girl (woman) at work who's 27 went out with a 17-nearly-18 year old guy the other day and we were all like "Go For It Gal!".
Somehow it doesn't seem BAD to me that way round, tho I know it should!

BobbyBiscuits · 06/05/2025 12:17

There's nothing unusual about a man dating a woman ten years younger. She was an adult.

It's weird to compare it to how you'd feel about a younger guy. That's not really the point is it. People fancy eachother and do stuff. Of course a 20 yo woman is attractive to most men, regardless of age.

unfold1 · 06/05/2025 12:17

MyOtherCarIsAPorsche · 06/05/2025 11:35

Females have always appeared to behave more maturely than males. It's apparent in primary school. You appear to be attracted to someone a little older than you because he's more mature. H and I have the same age gap as you do now.

Men generally are interested in younger women - especially your 'boyfriend'. He's proved that with his recent 'fling' and now he's proving that he likes a more motherly woman.

Your dilemma is whether or not he'll hanker after the 20 yo foetuses.

“Females have always appeared to behave more maturely than males”

^ I’m not an expert in this area so I can’t really confirm or argue against it. However I have heard this comment a lot especially from people in my parents generation.

Is there any hard evidence for it? How much is due to socialisation and expectations

TempestTost · 06/05/2025 12:18

Is your view OP that 20 year olds are too immature to have sex? What age can people decide that?

Especially when you are talking about just a fun fling, there are lots of things that a 20 and 30 year old might enjoy, going to films, dancing, etc.

I think a lot of women find it hard to relate to the idea of wanting to date a much younger man. Often, a lot of us don't find men in their early 20s very attractive. But that isn't typically true the other way around. In fact, I would go so far as to say that a lot of women at 20 don't find 20 year old men very interesting or attractive.

The idea that two adults have a vast power imbalance because one is older is just kind of a cliched idea, IMO.

SensitiveOverthinker · 06/05/2025 12:18

Met a guy who was 34 when I was 25. Thought it would be a fling. Just celebrated our 9 year wedding anniversary.
You sound pretty judgemental and immature yourself tbh OP.

AliBaliBee1234 · 06/05/2025 12:19

This is a little overdramatic. You say there's a power imbalance but at 20 I was very successful and mature. I would have happily dated a 32 year old.

unfold1 · 06/05/2025 12:27

AliBaliBee1234 · 06/05/2025 12:19

This is a little overdramatic. You say there's a power imbalance but at 20 I was very successful and mature. I would have happily dated a 32 year old.

How nice being very successful and mature at 20, lucky you x

Meanwhile many 20 year old students today are neither (many still live with parents, tough job market)

KnickerFolder · 06/05/2025 12:34

I wouldn’t be concerned about a one off fling with a 10 year age gap. Some 20 year olds are more mature than others. A pattern of dating very young women would be more concerning. I would be concerned that he likes the imbalance of power.

But now you’ve said that she was a summer intern, that would give me the ick. It’s not just that he is older, he had seniority over her at work. Creepy, unprofessional, and it shows a lack of judgement. That would turn me off.