Most Helpful Guy
it's usually the case. It's rarely about looks or personality - it's about opportunity. Of course people who want to cheat are likely more interested in the 'hot' options, but they tend to not actually be options - I mean, if they are hot, why settle for a guy in a relationship when they could easily attract a guy who is single? Unless they had some sort of preference for only doing guys that are in a relationship, but I've never met such a girl.
Anyway, he's a cheater. I don't think he is compatible with monogamy. You can try to fight it, if you want, but you will lose. You can not change someone's nature. Unless you have some interest in being poly-amorous, I would just break up with him..
Most Helpful Girl
I wouldn't care at all about how attractive or unattractive the other person is. The fact is, my partner would be a cheater so I would still end the relationship regardless. The other person's attractiveness level wouldn't make a difference and it wouldn't make me feel bad about myself or anything like that. I would just regret wasting my time on a cheater.