She's been dating this guy for like a year and a half, and it's long distance. Like, really long distance. (An ocean is separating them.) She said that she's had a crush on me since band camp, which was a few months ago, and we were talking about going out, and she said that she is going to break up with him to be with me. Should I be concerned that she'll cheat on me once we're going out because of this?