I've been with my current girlfriend for about 8 months. We've broken up and gotten back together about 10 times, all of which were essentially her fault. There have been times where she's lied to me and ignored me as well as just generally been rude to me. She has Post-traumatic stress disorder, and possible other kinds of disorders, so sometimes she'll act in unusual or otherwise bitchy way. I guess all girls can be like this, but even after I tell her not to do some of the things she does that piss me off (it's really not that hard to be honest to me) she will still do it. and I forgive her each and every time because she's really special and unique to me. She's extremely cute to me, but sometimes it's hard to forget the things she's done in the past. It gets me really depressed.
We always talk out our problems, but sometimes it gets to a point where there are no problems NOW, it's me trying to forget her issues from the past. I could make a list of all the things she shouldn't have done, but it would take too long.

The bottom line is: She's very unique and besides the long list of her fuck-ups, she's exactly my type of girl. I doubt I will be able to find another girl with her weird charm that I love. at the same time, She can make me feel really depressed because of some of the things she does. Even when I say we're over for good (which I have, several times) she begs and begs and leaves a shit-load of messages on my phone, crying, and I always forgive her because deep down i care about her and love her.

Is my inability to leave her just an after-effect of the relationship, or is it because we're meant to be together?

What should I do?

I'm just gonna start by saying leave her you don't need the shit. Now I don't know who I'm talking to here because I've never met you. But if you were like me, I'd say just dump her and have fun. There are plenty of fish in the sea as the always say. Being single isn't bad, its fun as hell. There is no commitment to one girl and you can go out with your mates and have fun with no worries.

I had the exact same problem, and broke up with her so many times thinking, "this is the last time." but it never was.
And finally, itjust was.
I guess, start doing things that prove to yourself you dont NEED her. because in the end, you guys will probably break up. Because she seems to just bring you down because of her problems.

Once you've seen how it feels to be without her and doing social stuff, you'll feel a little better about if you break up again.
And maybe it WILL become the last time.