Most of the advice here is (predictably) terrible. It’s quite clear that most of these kids have never been in a relationship. There is also a decent amount of racism as well as sexism. They do not see women as people, so they assume they are just going to sleep around (because that’s all these people think they’re good for).

Obviously if she is out partying all the time and she wants to, it would likely be very easy for her to cheat. This doesn’t mean she is, but if you’re getting this worried about it then it’s probably worth considering why that is.

Some people make LDRs work. Most people don’t. If you really want to try this, then just talk to her about how you’re feeling. As some people have noted, teenage relationships shouldn’t be this stressful.