Answer this question honestly and for your own sake: Is this an issue that you have resolved?
If not, there's no point in contemplating talking to her again. Sorry to be brutally honest, but if you admit that it's YOU with the problem, and you haven't solved it, there's no incentive for her to get back with you. Even if she does, the same thing is going to happen again.
If you HAVE resolved the issue, then you should just put the feelers out very gently: see where she is now in her own mind and whether or not she could consider being close as friends again. Then you can build from there.
However, be aware of the "unfinished business" trap: my ex and I were ultimately wrong for each other, but we got back together after two years. I was still as emotionally distant and she was still living in a fantasy world. There was a reason we had split up in the first place, and it was a good one. But we never got to end it properly, and I spent two years mooning over the way I had ended it. It was good for us to get back together, because we worked out the issues we had before and finally came to the conclusion that there was no hope for us. And, thank goodness, I've never been troubled with thoughts of her again.
It's possible that what you had can be had again. But you both have to want it, you oth have to need and it it has to be for the right reasons, Mein Freund.