Because they're probably in show off mode! As soon as their dominance is challenged, they get butthurt!
I listened to my ex talk about her failed relationships. I was okay with it.
bitching about others... it makes some feel taller
I think both are fine. Any guy who thinks every time he starts dating a woman hes the best shes had is delusional,lol. Why begrudge a lady her memories? Doesnt mean she doesnt want any new ones with u!