I guess the whole key to the thing is a) intent and b) what's within reason? I wouldn't change my entire personality for a boyfriend. But if I was doing something hurtful without realizing, I'd examine my behavior and be considerate. But there are those that get extremely possessive in a relationship, and are constantly convinced that you're out to cheat. That's not within reason, to me. At that point, I'd just realize that our personalities were not going to mesh, and that one or both of us would constantly be miserable.