Aibu to end a friendship because of this.

[JacNaylor]

Hi! Regular poster here, name changed as this is quite specific.
Dp and I have friends that we socialise with every couple of months.Helen and Nick. We're all late 30's.It started out as a friendship between Helen and I at a sports club but now we're equally fond of both although I wouldn't call them close or best friends.
Last week Helen suddenly asked me to go to a large social gathering related to the sport. I was surprised as it's not my thing, but agreed. Fast forward to today and travelling there she referred to me as her wing woman which I thought was odd but brushed off. What followed was a day of Helen basically on the pull, chatting to and flirting with most of the day to a man, Pete, whom she told me she had a "thing" with at the same event last year. I made it very clear that I was uncomfortable, told her how lovely Nick is and how it could destroy their marriage. Eventually she appeared to agree that it was a bad idea and it was time to leave. We walked towards the exit hand in hand then as we approached the exit she asked if I wanted money. I said "no" puzzled then she pulled away, said "if Nick asks I left with you" then disappeared into the crowd presumably to find/meet Pete.
Although I THINK she is after a flirtation/snog rather than a full affair, I don't know for sure but either way I'm not ok with it.
So, AIBU to back off from the friendship, firstly because I don't approve of her blatantly going on the pull when she's married but secondly because she knew I disapproved and was fond of Nick and yet still managed to implicate me in it?
What would you do? Help much appreciated. Thanks!

@LexieLulu is right
She knows you are not happy so is covering her back... she has the get out story all set up. Tell your own husband and back off slowly.

She clearly used you- and always intended to use you as a cover. She has tried to force you to be complicit in something you have made clear to her causes you to feel uncomfortable. She expects you to lie for her. I would keep well away from her if I were you.

We all make mistakes, but this was pre-planned and thought out. It's quite devious and I wouldn't want a part in it. I would tell your husband.

As for the "I was so drunk" texts, I'd simply reply that she didn't seem drunk when she told you to leave, and if you'd thought she was you wouldn't have left her. I'd also make it clear you want no further part in this charade.

You were there you know how much she drank.

You know she told you she'd done this the year before too.

If you really thought she was behaving this way due to alcohol then 1, you don't sound like the type of person who would have left her and
2, you probably would have thought about it when you were writing your first post so the likelihood is you would have mentioned it because it would have worried you.

I ended a very close friendship in similar circumstances. It was the being used as cover that pushed me over the edge.

No way was this a drunken mistake - she intended for this to happen all along.

I'd reply with 'Bullshit. You weren't drunk, you were using me as cover for cheating on your husband, and you left me to do a 2-hour journey on my own so that you could no doubt shag the bloke. Don't contact me again.'

I wouldn't tell her husband on purpose but I wouldn't lie if the subject came up iyswim.

I would call her out on her lies of being drunk though.

At least by telling her of course she wasn't otherwise you wouldn't have left her!

I hAd a friend that when we went out would pick up random men & go
Back to their place. I did talk to her many times about the dangers of it.

The following morning she’d ring me crying saying how could you leave me I was so drunk trying to blame me for her bad feelings.

Looks like a similar situation

I'd reply with 'Bullshit. You weren't drunk, you were using me as cover for cheating on your husband, and you left me to do a 2-hour journey on my own so that you could no doubt shag the bloke. Don't contact me again.'

I’d respond with that. In fact I did when my “friend” tried to use visiting newborn DS2 as a cover for shagging her bit on the side. Her DH was also a good friend of ours and it was a really crap position to put me in and an even crapper thing to do to her DH.

so far all you know is she flirted with men which plenty of people do I know some people don't agree with this whilst others think it's harmless. The fact she said Nick would be ok with it means he's probably aware of what she behaves like on a night out and for all you know they could have some kind of agreement on this so I wouldn't tell Nick as you didn't actually see her do anything. Personally if she's always been a good friend and you get in well I wouldn't cut her out over a stupid drunken night as you say she's never done this before to your knowledge but I do understand I might be in the minority here. If she did it again or it turned into a regular thing then I would rethink. We are all only human and can all make mistakes so if it was one of my friends I'd class it as a stupid mistake and a one off this time.

She planned a hook up from the start and intended to follow through.

The clues....

Saying you were her wing woman.

Saying Nick would probably 'cope'

Telling you to tell Nick you went home together if he asked.

I'd definetly pull away from the friendship.

Agree with the PP who suggested a message explaining in detail her actions!

Thanks for explaining things. She isn't a good friend as others have said. Don't cover for her but I'm not sure I'd tell her partner.

I don't think id reply at all. Can you be bothered with the drama? She's like a 15yr old!

I walked away from my best friend, and bridesmaid, and our friendship for very similar reasons- I wasn't willing to be used as an alibi for her affair. While it's a shame our friendship didn't last, I'm glad I didn't compromise myself.

I'd reply with 'Bullshit. You weren't drunk, you were using me as cover for cheating on your husband, and you left me to do a 2-hour journey on my own so that you could no doubt shag the bloke. Don't contact me again.'

Perfect reply. Covers all the bases.

Screenshot all the messages about this weekend so she can't try and deny it all later.

Don't pussyfoot around here. I second sending the pp's response. She's no friend.