Toxic?

A while ago I got out of a serious emotionally abusive relationship. I started seeing another guy who was really sweet and passionate. He told me he’s ruined a lot of relationships with his jealousy issues and he’s been working on that. I invited him to a family party and we had a great time! My phone was in his pocket (I was wearing a dress) and he showed me that my ex boyfriend from 8 years ago sent me a Facebook message. Granted two weeks back that same ex told me he wished things could have been different for us. We agreed too much had changed and were better off as friends. I told my new guy about this and he didn’t seem to care. That message was literally just a link to a song I might like and I responded I already knew it and that was it. My new guy flipped out said he can’t trust me and ends it. Two days later he’s texting me he misses me and wished he knew he could trust me and that he wished I didn’t mess up....did I dodge a bullet or did I actually do something wrong?

Edit*** We’ve been seeing each other a month and a half and had not made anything “official” He had even said on two different occasions he couldn’t be mad if anything happened with anyone else and I couldn’t either because we weren’t boyfriend and girlfriend yet. I brought this up and his response was I am just justifying my actions