Is it ok to go ask a girl out again that you had a bad breakup with?

I'm a really picky guy when it comes to girls and it's not that I'm looking for the best looking girl it's their personality and things they do. For example if I met a girl that was perfect but she said like a lot I'd lose my mind and couldn't date her. Anyways in my freshmen year I dated this girl and things weren't going well so I broke up with her. I could have done the break up a thousand times better but I didn't. It wasn't tell sophomore year that we started talking again. I'm going into my senior year and no matter how I look at I can't find anyone that I really want besides her. Some of my friends say don't ask her out and others say do. I'm confused on what I should do.