I agree. I think the guy you like was interested in you first. I think if anyone is second hand garbage, it's your friend. Of course, she's not. I say it that way because I don't think you'd talk about her that way, yet you talk about yourself that way. Obviously, you had TWO guys into you and you were the first choice for them both! If anything, you should be flattered. It sucks that the guy you're into is now focusing on what he thinks he can attain without destroying his relationship w/ his buddy. That shows that this guy you like is a good guy. However, sometimes, things aren't going to be smooth and I don't think weight is the issue here. I understand why you think so though, because we have all felt this way in the past.
What are you going to do? Quit and gain back all your weight? That would be a self-fulfilling prophecy. You should take good care of yourself because you're worthy of the best...no garbage anywhere in sight! Take care of yourself and hang in there so that you can look back at this time and see what a fighter you were..that you held on even when it got really, really tough. Go workout that stress of yours and feed your body right because if you don't love yourself, how can you find the love you want?
I hope I'm not being too harsh, but I just feel for you and I don't want you to quit.
Take care.