I had a baby 5 months ago with a person who I had just started dating (not officially boyfriend and girlfriend but we were going on dates for roughly two months before we got pregnant much sooner than expected)

As a result, he freaked, and wanted nothing to do with me. He came around after our baby was born, insisting that he wanted us to work on our relationship, see where things go, and be a father. At first I was apprehensive. But I did agree. And we didn't start dating but we were spending lots of time together (the two of us and the three of us). But we spend easily 5 days a week at least together, he sleeps over or we sleep over usually 2-3 times a week. Dinners. Grocery shopping. Appointments. Long weekends. We do laundry together. Get grandma to watch our baby so we can have date nights.

Well he's been quiet for a week. And today all over his social media he made the big announcement basically showing him and this girl spending the weekend together and introducing the internet world to his girlfriend with an extra "love you babe" caption at the end.

I'm hurt. I'm surprised. I just don't understand. If he didn't want to work on us like he said he did, why has he wasted my time for the past 4ish months. I'm now emotionally attached to him. I feel the same way I did when he left my life the first time. Crap. Two months ago we were talking about moving in together so our baby has both parents and because he thought it wasn't fair that I was paying for everything on my own. He wanted to help. Wanted to be involved. He called us every night to tell us he loves us.

I would be lying if I didn't say I was hurt. And embarrassed. And upset. Very upset. I don't want to talk to him. Don't want to see him. Don't want anything to do with him.

I wish he had said after I gave birth that he just wanted to be a dad and not be anything with me. I feel used. Did he just pretend to be involved with me? I feel lost.

This is my first baby yes, but I have spent all of my life being rejected by guys or humiliated in some way. I pour myself into a guy and then I find out he cheated. Or wants to see other people. Or just breaks up with me with no explanation. I have major trust issues. And when I first met my babys dad, he was the nicest. And he spent 6 months trying to convince me to just go out to dinner with him because I told him honestly I always get hurt and struggle with trusting people. And he said he'd be there and wait and such. But two months in of going on dates I get pregnant and he leaves because he didn't want a baby. Then wants to make it work with us. Then leaves yet again. What the heck do I do? I'm angry. I'm hurt. I need rational advice before I lose my marbles