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

So backstory.
We haven't been together long, only a month and a half. He was super sweet when we met, a friend of ours hooked us up. We seemed to kick it off so we got together. Within a few weeks, he got me pregnant.
When I told him, he was happy and excited and wanted to start a life with me and our coming baby. Was really sweet and understanding so far dyring the pregnancy, and he had been cheated on before so everyone thought he wouldn't be one to cheat. 
Last night he left his facebook on at my house, and I was curious. So I looked and I saw his ex messaging him like crazy daily trying to tell him to leave me and go with her. Also, I found very vivid cybering between them. I called him and he just acted nonchalant like he didnt see what the big deal was. He jist laughed and passed it off. I was so upset and he didnt care. 
This morning I saw another message with another girl. This one didnt have cybering,  but he told this girl every night that he loves and misses her and said that when he visited her hed never leave, calling her sweety and beautiful and just talking to her like she was his girlfriend. When confronted all he said was that he doesnt mean those things and just says them to make the girls feel better. But it definitely seemed like he was instigating everything.  
At this point, im hurt and confused and don't know what to. I wanted to make it work for the baby but I have been cheated on before and I dont think I should have to deal with it again.
<bot>: My boyfriend and baby daddy is fb cheating on me with two of his exes, and doesnt see it as being bad or cheating.