Should I get in the way or let time tell?

I need more info to evaluate your situation as best as I can. Does she know that you love her? If she does, what was her thought on that? What was her response to your suggestion of marriage? What kind of relationship are you having with this girl? I hope it's not more than friendship in her mind, because she doesn't sound like a great gal to marry if she's messing around behind her guy's back with you. If she can do it to him, she'll do it to you. When you mentioned marriage, she clearly understood how you felt about her. Now, it's pretty much up to her to decide what she wants to do with her current relationship and with you. Can't make someone want to be with you and love you if they don't. Take a look at the situation between her and her boyfriend. Do you want to be in the her boyfriend's shoe? Need more help? Then reply back with answers to my questions.

Great to hear that you were patient enough to wait it out & you were rewarded with the prize! Good for you! Congrats! :)

This may sound tough, but I would let her know that you love her and want her for your girlfriend but don't get in the way with her boyfriend. She has to make up her mind for herself or else she won't be making her own decision, she would be making yours. You can tell her how you feel, which I'm sure she will take into consideration when choosing who she wants to be with. She may only be with him right now because she knows you're heading off to school soon. She may just not want to be lonely while she is waiting for you. However, one thing that I would be very careful of is to not hurt her by making promises and then not fulfilling them. I'm in the same situation with a girl and I have had to allow her to have the freedom to make a decision on her own. We will be apart for 3 months, which should be long enough for the girl I like to make a decision on whom she wants to be with. At any rate, don't let the thought of her being with someone else right now cause you to lose heart on being with her in the future, but be careful also to not hold on so tight that you cannot let go of her in case she chooses to not wait for you until college is over. Like I said, this all sounds tough, but if she is meant to be with you, and you have let her know how you feel, she will come back to you. If not, try to remember that there may be someone else planned for your future. Hope this helps dude! Good luck!