Am I wrong?

My husband has some issues with drinking, that he’s learning to manage, and it brings up issues about his time in service. I’ve begged and begged him to talk to me about it but he won’t. Last night, after he thought I fell asleep, he messaged someone he was in the service with. I have no idea if they served over seas together or if they were just stationed together. I had already knew she messaged him first and he specifically told me that he would not message her back last night because I knew he’d be up all night messaging her and I’m not comfortable with that. I knew he’d be up all night messaging her because she just doesn’t know when to stop messaging. So, since I saw him message her after he thought I fell asleep, I checked the messages after he passed out around 7am from drinking and staying up all night messaging her and his brother. Keep in mind, he didn’t get off work and in bed until 3 and he and I talked for a bit before he thought I fell back asleep. He had deleted nearly the entire message thread. I’m so angry. He knows I had major trust issues from my previous marriage. I’ve worked hard on getting past them, then he did this. I kind of assume they were talking about the things that I beg him to talk to me about, but it still doesn’t make it any better for me. I don’t know that’s what they were talking about and I’m his wife! I try my best to listen and be an open door for him to talk to. I just don’t know what to do or how to handle this. I know my instincts are telling me to run far far away. Please give me some sound advice on how to handle this. I’m losing my mind.