Need advice!

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So my boyfriend and I broke up for a month and I ended up getting pregnant. I now I didn't sleep with anyone else during that time. I was still occasionally spending the night at his house. When we found out he said he would help me out and take care of me but he wasn't sure if the baby was his. I told him fine when the baby is born we will have to get a DNA test to confirm. My entire pregnancy he spent talking to his ex girlfriend. I was able to let that one go. About two weeks before I had our son, I went through his phone and found messages to the mother of his brothers kids, his ex sister in law. I knew they had slept together in the past and that they had an odd relationship. (She is currently with a best friend of theirs.!) (ha). The messages read that she will always have his heart, that he wishes they could have been together because they would have had beautiful babies and that he doesn't love me because I'm all wrong for him. It gets very personal and wrong. But this hurt me to the core!! I don't know how to get over this.