<human>: Condense the text into a few key points

My GF and I have been together for over 2 years now. We've been through a lot together, which meant we have a VERY strong love and bond. 

I am very emotionally unresponsive. I don't get easily upset, I don't ever get sad even when confronted with hard-pressing situations, and I just tend not to get emotional.

My GF, however, is the polar opposite. She has Bipolar as well as Fibromayalgia, which equates to her being in pain constantly. She has a very hard life, and is struggling with depression. She is extremely emotional, and tends to get upset at anything she can. She dwells on subjects and cant move on emotionally. 

I feel like I always have to be there for her, to be a shoulder to cry on, but I can't. I honestly can't stand being that person, I'm just to unemotional to do it. It puts a it of stress on me, and i don't know if I can take it.

We broke up about a week ago for the above reasons, but she still thinks we have a chance. She claims that she can get better, that she can find help elsewhere other than from me. She's deadset on staying with me that she'll do anything. She claims that a medication for Fibromayalgia she's on made her very emotionally jumpy, another problem in our relationship. She would get angry or upset extremely quickly with no warning. She is stopping that medication and thinks she'll be like she used to be, much more stable.

However, i think that no matter what we do now, our relationship won't work out. I think there's too much emotionally variance between us, and eventually it will be a problem again. I want to get back with her, I still love her, but I think that no matter what, it won't work out in the end. Our relationship is just a ticking timebomb.
<bot>: Too much emotional variance, she claims we can get better and improve, but I don't think it'll ever work out in the end.