I was gonna offer great reams of advice, but I remember being young and realize it took me till 35 to find a relationship what was worth my sticking around.

Screwing around in crazy places is fun, but she is doing it with another, so it is the fun and not you that calls her to do such things. Not saying she is a whore, she's just exploring, as you are, you're young, it's natural.

So I guess it depends on what you're looking for, but in my own experience, youth is for figuring it out, at least in today's world. So although I clicked this thread with lots of advice I now realize I have none, oops.

...except, define what you need and then you will be clearer to see it when it presents itself.