<human>: Can you condense the text into a few key points?

We've been together for 5 years and almost 1 year additional for a break. It ended in resentment and we never explained our feelings openly when it happened. She resented things that I did or haven't done for her over the  years. I resented her unfairness and only seeing the issues one sided.

During the 1 year break we got back together for a few months and I thought things were going well but she broke up with me to pursue someone new. She still had resentment from our past and was mad that I let her leave so easily. 

The "letting her go" was almost 3 months of her coming home late (she's since moved out) and avoiding me and me getting angrier about her not wanting to talk about things, but never actually telling her how much she meant to me. She's always been insecure and I felt that my actions showed how much I loved her but  I wasn't good enough.

It felt out of the blue when she said she was pursuing someone else but changed her mind a week later saying she wanted to work things out. Then changed her mind again and she's now with him. 

I've had so many different feelings about it. I've finally told her all of the feelings I've had and explained my side of every issue we've had. I feel like this is the first time we could be truly honest with each other, as things can't get any worse. 

She's told me he doesn't measure up to me and she misses me. She's still seeing him an she's scared her actions have made us unfixable. We ended things 2 weeks ago and it's not getting any easier to deal with. I'm afraid to let go or to let something go unsaid. I feel like I have to make things right and accept my faults and forgive her. I want her back. 

Has anyone been through something like this and been successful?
<bot>: We had a relationship full of insecurity and resentment but now we're more open, i want her back and I'm sick about it.