Cheating, infidelity, suspicion, insecurity, jealousy are natural feelings in a relationship. A hot woman or man or someone who is more their "type" can make anyone feel uneasy in a relationship.

But how about we talk about these feelings??? How about we explore why someone wants to cheat? How about we accept that people are human and have emotional needs. Try to bond with her instead of breaking up, if that doesn't work then yes, move on. But don't think this won't come up again in a romantic endeavor.