My relationship has been so unstable lately that I just don't know what to do anymore. 

I feel so attached to this person and when things go wrong, I feel like I can't handle life anymore. It sends me into an incredible depressive spiral. Things go wrong at least once a week. I don't understand why it happens. Last night I cried because he said something mean and he did the whole, "no more relationship, I'm done with you" thing. 

Then I end up begging him to come back, and I don't know why. It really seems like it's not worth it sometimes and I think I'm holding onto a hope of something that could've been, but isn't. 

I went out into the street last night and tried to get hit by a car, until a friend came to pick me up off the street because she realized I ran off. I wanted to drive my car off of something to see if the crash would kill me, but I kept thinking about my cat, and how I would feel awful for leaving her alone and having her wonder why I never came back for her. 

This is a stupid reason to be depressed, but I can't help it. I've already been diagnosed with chronic depression and generalized anxiety disorder and this relationship is triggering me badly. 

I just want to be happy with him. I don't understand why this is so hard. I also don't understand why leaving the relationship is so hard if he's going to treat me like shit. 

 Sorry for such a stupid post. I guess I just don't know who to talk to.