[ShagginJet]

This is just a f**ked up situation. Seeing how you're 18 and this is your first relation, this one might be a little over your head. It's nice to have girls in town that you can go out and have fun with. But knowing that she's seeing someone else can be an emotional roller coster and it's hard to deal with if you don't know what you're doing.

If you feel you can handle this then take it on. If you're not sure then let it go. You'll have many more times in your life to get some, don't get greedy.

As far as the other chick who's chosing between you and another guy. Call him up, tell him you're f**king her and that he needs to back off. Confront him in a bar and kick his @$$. While you're at it, kick her to the curb for stringing you along like a F()()L. Then she'll get none of you.... (not your fault you're young)