I don't have a whole lot to add and I agree with Bleeker - without knowing you and your ex and the whole story, anything you read here is speculation. The clues that are niggling at me are that you let some external entity talk you out of your relationship with her, and that you didn't have the cajones to tell her why you were breaking up with her. You dumped her with no explanation. Why should she take you back?

And something she said, that you're both co-dependents. Not to be judgmental, but if it wasn't a good idea for you two to be together before, what makes you think anything's changed? (And, sorry to be so personal, but if the issue is alcohol, you're spending a lot of time at bars...have you worked on your dependency issues? If not, you're nowhere near ready to move on with anyone, least of all her.)

If you talk with her today and she expresses a desire to see you, then go. If she doesn't, don't press her.

Unless her fiance is a real jerk, which you have no way of knowing unless she tells you so, let her go build her future with the man who picked up the pieces after you broke her heart.

Roxy