I feel like my boyfriend is still in love with his ex or am I just crazy?

My boyfriend and I have been dating for about 2 years. To keep a long story short, he has a child with another woman. Despite her being his baby momma, she isn't bitter about us. She is pretty cool. As I got to know her, she is so down to earth. We follow each other on Facebook and I interact with her and so does she. My boyfriend never told me exactly why they broke up. He just said because of differences and distance, I don't know the details about their relationship. Here is where things started getting a little uncomfortable for me. My boyfriend has to travel to see his son because she lives in a different state. So he invited me to go this time and I agreed to tag along. When we got to her house there was another guy there. My boyfriend looked a little tense when he was there. As she introduced us to the guy, my boyfriend seemed standoffish. It was somewhat awkward. Later that night, I overheard him talking to her on the phone. He thought that I was asleep but he was saying "I don't like him there around you and my son". "I bet you don't even know him like that to be trusting him around our child" basically talking bad about the guy. They were very nice and welcoming. He seemed to love her, so It got me thinking as to why he would say that when there was not an unpleasant encounter between them. It has been two weeks and I still haven't talked to him about it. what should I do?

I feel like my boyfriend is still in love with his ex or am I just crazy?
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