This chick

I finally get to go out with this girl I have liked since like 7th grade, and she liked me too, but she was datin this other dude, but now they broke up, but see now the dilemma is that now she has all this stress and smoked weed, well I used to smoke...

weed you know do all that bad stuff, but now I'm a huge christian, but I still like her, what should I do in this situation

I think you should help her as a friend right now - try and show her the better things in life and try to keep her mind off the stress so maybe she'll stay away from weed. Once her life is on the right track and looking better, then you can act on your feelings. But right now I think you need to play more of the friend role till things get better. If not it's going to be too much for her to talk in at once.