<human>: Can you give me a shortened version of the text?

My ex and I broke up about 6 months ago because he was moving away for work and neither of us wanted to do long distance. I was devastated, but we thought it was the right thing to do. I began dating other people, but two months ago he called me to say he wasn't moving anymore and that he missed me and wanted me back. I said no, I was moving on. He became more persistent and one thing lead to another on a drunken night out and we started sleeping together again. 

He then went on holiday for a few weeks, during which time he slept with a girl he met and I found out through his friends. I asked him about it and he said it was a drunken hookup. I wasn't happy about it, but we hadn't had any talk of being exclusive so I kept quiet. He came back and things went back to whatever it was that we called normal. Until out of the corner of my eye, I see a facebook message from her on his phone while we're hanging out. I looked away because I didn't want to know but its been eating away at me. She likes his pictures on facebook, she posts on his wall once in a while. 

He's away on holiday again, and when hes drunk he talks about how much he misses me and can't wait to be home. She's liked every single one of his holiday photos. I finally caved and had a look at her profile, and my heart just dropped when I saw he'd liked a few of her profile pictures. 

I wasn't as hurt by his drunken hookup as I am by the possibility that they're still keeping in touch. Am I overreacting? He's the one that got away, and I do believe him when he says he cares. But what does it say that he can't say these things until he's drunk?
<bot>: hooking up with ex boyfriend again, he might be talking to another girl, am I wrong for feeling cheated on?