<human>: Can you succinctly summarize the text in 1-3 sentences?

So we broke up about a month ago but it was fairly calm break up and we work together so we decided to remain friendly. After a few weeks we were acting basically like we were back together ( talking and spending time together regularly and hooking up a few times ) even though she was adamant that we were NOT back together because she wanted the freedom etc. The one thing I made clear was that with our complicated situation all I wanted was complete honesty, including if she wanted to hook up with anybody else. 

Last night at work I found out that everyone knew but me that she has slept with a co-worker a few weeks ago TWO WEEKS after we broke up and tonight they decided it was time to tell me. I'm furious and feel like an absolute idiot, back stabbed and embarrassed that I let myself be set up like this to be dropped so hard. What should I do? Should I calm down because we weren't together? Should I let myself be super angry? Is she at fault for anything? 
Sorry for the wall of text/rant but I wanted to get it off my chest. Any answers would be appreciated
<bot>: Broke up, remained close friends with a promise of honesty, found out she slept with a coworker, what do I do?