I am stuck in depression after a breakup?

If you really loved her then she will always be a part of you, I know that sounds crappy right now but you are going to learn a lot from it... If you were in love she will take a while to get over. It is hard to be best friends with someone, date them, and just lose them. I know how you feel, like you lost the one person you really trusted and cared about. 3 monthes might seem like a long time, and when you feel suckish it seems even longer, but don't worry you will get through this. I know there has already been what seems like forever amount of time but give it even more time. Try not to act depressed, hang out with your friends, have fun, and live life don't stop everything just because of one person. If she isn't smart enough to realize what she had in you then she honestly doesn't deserve you. It will be ok life will get better and in a few years when you look back you'll be thinking "wow i really liked her and i was devestated but i learned from it and it made me a better person". It'll be ok just remember to have fun and enjoy the good in life! Good luck with everything, hope things turn around soon, and God bless :D