Should i just stick through it?

She is in an emotional state and probably does not realize how it is affecting you.You probably should talk to her about whether she should be in a relationship right now while she's working on these horrible problems from her past. She seems to have taken you on as her confidante as well as her bf. That's probably good for her but you find it too much of a burden. It is really a compliment that she puts on a facade for her friends but lets you see the real you. You need to examine your feelings for her, I don't think they are very strong or you wouldn't be this resentful of her. If you're going to end this and it sounds like you are. Do it as kindly as you can and as soon as you can before she gets even more attached to her. Don't give her some phony reason that she will know is a lie and make her self esteem plummet just tell her you are not mature enough to help her handle her problems. That's the truth isn't it?