I'll try to make this as quick as possible. Me and my ex fiance had a good relationship going for about three years before she decided to pop the question. I was excited and I said yes immediately and was looking forward to our future together. 

About 2 months later I notice that she's becoming increasingly stressed for seemingly no reason. I worry a lot about her because she has been diagnosed bipolar in the past and though she was pretty much fine in the last 2 years I was worried it was resurfacing. She was also having a lot of trouble with some of the people I considered my friends at the time who were pushing her away and trying to create space between me and her which was driving her crazy (as they were supposed to be her friends as well). 

I was obviously sympathetic to her as I cared about her a lot and wanted to make sure my girlfriend now-fiance was doing okay. So I tried to help her out, encouraged her to meet people and make friends as I figured that would be healthy for her. I suggested therapy and possibly medication as it appeared the Bipolar symptoms were re-surfacing but she refused that for a time as she didn't want to go back on meds.

A little more time goes on, it's now apparent that bi-polar is really kicking in and she began telling me things like "I don't know if I can even feel love right now". During this time she has become increasingly close to one our co-workers (we all worked in the same place.) At first to me it's fine, I think it's good for her to have her own friends. As time goes on they spend increasing amounts of time together while spending a less than average amount of time with me. After a bit I outright ask if there is any feelings or anything I should be worried about there and she denies it completely insisting that it's nothing.

Pass a little more time, he comes into work with a hickey on his neck and I pretty much knew something was up. My friends (unknowingly to me) invite this guy to a party, get him drunk and ask about the hickey horrified to figure out that it was from my Fiance at the time. They let me know, I let her know I know, and then interestingly she breaks it off with both me and the other guy (though they are still friends) and comes to me to apologize.

This is where it gets complicated. She came to me apologizing and crying about what had happened. How it was the worst mistake in her life and she regrets everything that she did. She tells me she doesn't know what to do without me in her life and she doesn't want to lose me. And honestly, I think she was sincere, and I don't think she would do this again.

However that was about 6 months ago. Since then me and her have been in a sort limbo. After about a month I began telling her that I do care about her and want whats best for her and things could be worked out with a lot of talking and time. She was telling me she doesn't know what she wants  or whats healthy for her, or if she was even in the right mental state to make a decision like that. She told me that I might have to be okay with just being friends with her and not necessarily expect a relationship. Over time being told this over and over again, though I offered her support and advised her to see professional help I began drifting away from her slowly.

Two weeks ago, after not having seen much of any progress at all being made, I told her I was ready to move on. It was hard because we both still cared about each other but it seemed apparent that  nothing was about to change. I left that day, and then she turned around the next morning now confident that she wanted to try to patch things up with me.

To me it's just feels like it's been a little too long and too late.

TLDR: Fiance cheated, she apologized, I told her we could patch things up then 6 months later when she was ready I had moved on.

Am I the asshole for saying we could patch things up then switching when she was ready? 