My two best friends just shacked up.?

Worst part being that (the guy) knew how desperate and empty the fact of completely losing her makes me feel. She knows that I have i have feelings for her, but has NO clue about how much. I freeze up most of the time when I talk to her. I may sound like the weakest *%&(well use the synonym gay here)nyou have ever seen or heard of. There is also so much time left where it would be easy to lose her if I tried anything.... I have no clue on how to respond react or think other than listen to Your Own Disaster 04 by taking back sunday. Some other alternatives would be really nice. maybe a way to make goo song writing out of this? I can't write songs but I always know how to create situations used in them. So this is kind of a couple questions.