AIO messages found in husbands phone

I had a feeling something was up with my husband and I decided to go through his phone. These are between him and some girl in his call of duty clan or whatever it’s called. He spends more time on that game than he does with me or the rest of us. Apparently these messages were meant to be a “joke” but I don’t find it funny. He doesn’t even talk to me this way but he’s talking to her like this. He said I’m making something out of nothing but what man talks to another person like this and call it a joke. And what kind of woman who knows he’s married lets a man talk to you like this. When I told him I don’t want those two talking anymore he blew up at me. I really think something is going on and I want it to stop. One of two things will happen either it will end or my marriage will.