<human>: I'm in a tricky situation because this all happened within the last 24 hours.

I've had my suspicions about my girlfriend and her work colleague (M) for a while. Last night I saw the text messages that confirmed my suspicions. They were both out and drunk earlier in the week and texted each other when they got home and admitted to one another that they liked each other.

I saw these horrific text messages last night and I just broke down. After a while, I confronted her about it and she admitted it. There were plenty of tears and we tried to solve it, but she's not happy. I told her I can forgive her and work on our relationship, but she would have to do the same and tell her colleague to back off completely. I'm not sure if she will do this or not.

She thinks I'll never trust her again and the relationship won't ever be fixed. I love her so much and I have always worked hard for it and I think I could make her happy again and make it work. She was a mess whilst we argued about this and she cried and said that she didn't deserve me, etc. Despite that, we are not together anymore, because she's so unhappy. And this has made me incredibly unhappy.

How should I proceed with this, bearing in mind how strong my feelings are for her?

Can you give me the gist of the text in a nutshell?
<bot>: Girlfriend texts colleague a lot, admits to him that she likes him. I find out, we argue and break up. I am devastated and I want her back more than anything.