Bit of an over reaction, I think.
He is dating YOU. So, he obviously finds you attractive.
Surely who men fancy, is more down to looks anyway? I'm sure most men would choose Kylie Minogue or Jennifer Lopez over a 20-24 year old, because, despite being in their late 40's, they are still hot.
My aunt, who sadly died at age 72, could have passed for a woman in her 40's. She just hardly aged, no wrinkles at all. She would come clubbing with me in her 60's and she got hit on by young men all the time.
Disagree totally with pp who said that at 25, she knows she looks better than she will at 35. That's rubbish, it all depends on how you age. I am 46 and I think that I look better now, than I did at 26 (still looked like a school kid at 26!).
If I was single, I'd not want to date a guy in his 20's, because I don't think we'd have much in common and I just can't fancy blokes that young. I can't imagine dating anyone over 55, but hey Richard Gere is 66 and I'd date him!
My DH came out with some corkers when we met, because he just wasn't thinking. The 2 that I remember most are:
"I like oriental women" (I am blonde with blue eyes!)
"I've got an invite to a wedding but there's no plus one...probably cos my mate knows that I never stick with relationships for very long"
I really did think about ending the relationship at the 2nd comment!! Anyway, here we are all these years later and we still laugh about those comments.
Don't over-think it. Just keep your eyes peeled for anything else.