I need relationship advise ASAP!!!

Lynette

So my SO and I have been together for almost 3 yrs and through a good part of our relationship it’s been rocky with finding out he cheated on my within a month or two of being together. Then finding out he texted a girl about how he was bred to sleep with her while he was super drunk (still no excuse) but i dont know we got through it and now everything is perfect we went through all that bullshit and are at a good spot but I feel like it’s too good to be true. I also recently found out that he’s txting some girl name Samantha which was by accident non the less even thought it’s harmless nothing out of the ordinary. I have asked him if anything is going on he got annoyed and said “no but I don’t like you thinking that about me even thought you have a right to. I haven’t been perfect but I am in love with you and only you.” I just can’t shake the feeling like he’s not telling me something. Is it me over reacting or should I talk to him again?