Search Results: telling an ex about a new love

Ok so me and my boyfriend have been online dating for almost 3 years. I love him so much and we consider our love and relationship to be real and serious well he says I'm his first girlfriend ever and that he never had a relationship before me. Well I remember him on another website (the one where we met from) before we started talking dating flirting and sending out flirt/love emojis and saying how awesome she is. When we first started he said she was his ex and that they made an agreement that when they found someone in real life that they'd break up. Ok, fast foward to 2 years of us being together he says that I'm his first and that she was a *pretend gf* and that made me think what am I to you then? He said I'm real and that I'm his first girlfriend ever he made me insecure, jealous, and made me have trust issues. I used to bring it up and get angry at him everyday for it til the point he said that same things over and over to be that I was his first that I calmed down but every once in a while it still eats at me and is in the back of my mind. Like today I was showing him my new laptop and I said "let me search your username on google to see what we'll find" then I seen what I saw a long long time ago that pissed me off his Yahoo answer profile with him flirting w/ that same girl. I couldn't help but click it and got annoyed which said he was last active 4 years ago. He was telling me to get off but I got upset and over reacted and was questioning what a pretend gf/date is. He hung up on me and I was calling him back and we talked a little. I got upset and started crying. I asked him if I messaged her and asked if you guys ever dated what would she say he said "Idk". I don't care it's just the fact he said "pretend gf* and said I was his first girlfriend.. It doesn't make any sense to me? I don't understand. What do you think and did I overreact or would you feel the same way I do? He just hung up on me and said his phone was dying even though I was crying. I think he fell asleep.. I feel bad now