SUBREDDIT: r/relationships
TITLE: Me [23 M], struggling between staying single or getting back with girlfriend
POST: - Here is a link to back story.

Basically I broke up with my ex over the summer because she always threw all of her problems on me, talked about guys she had sex with when she originally broke up with me to make me jealous, etc. It was a pretty toxic relationship. 

Now we've been talking again for about a month or so and she seems to have changed. No displaced anger, no jealousy, nothing. It fact, the relationship is pretty laid back, something I always wanted to begin with. The only problem is, I am questioning whether or not I want to be with he now. She hurt me a lot in the past, and now I'm wondering if I should just be on my own and focus on myself. I know I'd be completely okay if we broke up, and I being in a relationship isn't really that important to me at this point my my life. My goals are more focuses on getting into finishing school, applying to grad school, and possibly applying to the peace corps. However, I don't feel like she's done anything since talking together that makes it a bad relationship, so I am conflicted.
TL;DR: 
Was with girlfriend, broke up after a lot of drama. We've been talking again, don't know if I want to be back with her or be on my own. Help.