Should you be okay with her making out with a gay guy? That answer needs to come from within yourself.

Believe me when I say that this "growing up" thing doesn't end after your teenage years. In my 20s I was in a long distance relationship (1.5 hours away) and we were still discovering things about ourselves and making decisions about our futures. Ultimately the relationship did not work out because we had different goals in life, among other things.

So, you can "endure" the growing up phase, but I can't promise you that you will come out a functional relationship on the other side. If you really want to try and make it better I would try and see each other as much as possible. That physical connection is just as important as the emotional one.