You know what, it's perfectly fine to go after someone if they have a partner.
It's not cool if they are married, have kids and those kind of things. However if you meet someone, you like them. Why should you not try?
It's not like he pestered her. She was up for it, they went for it. The wrongness is on her side.
well that just fucking sucks....you do realise not everyone is legally allowed to "marry" their partner.
and even if they could marry and haven't yet, i wouldn't marry a piece of shit that gave it to the town slut because she could because it wasn't "official". Your partner must love live, i hope he/she is banging the town nag because he/she can....