Is this fair? *cross posted in case I don’t get responses on the other*

My husband and I are currently recovering from a pretty rough patch in our marriage. We almost didn’t make it.. no cheating or anything but then I found out he has been snapping this girl and has a streak with her… 26 day streak. He never even mentions her. Obviously I assume the worst. I straight up ask him if he’s cheating or doing anything behind my back and he swears he’s not. He didn’t get oddly defensive or angry.. The conversation is casual but she sends selfies when talking to him. He said he didn’t tell me because he knew I’d “react like this” no I wouldn’t have? I’m only suspicious because it’s sketchy he hid it. I told him if he really wants to be friends with her and there’s genuinely nothing going on I would feel more comfortable if they talked through text message or something. Snap is SO sketchy. I also told him I don’t like her sending him selfies all the time. He’s a married man. Also…. Why would he even want them?? He apologized and said he realizes how it looks.. I’m so paranoid now. He told her he doesn’t want to talk on snap anymore and she said okay… but I don’t likeee it! He’s allowed to be friends with whoever he wants. (I’m not saying I ALLOW him to… he’s a free man lol) I’m not controlling.. I just don’t like THIS. I’m annoyed. He was even keeping his streak with her while we were going through our crap. He swears he doesn’t discuss anything personal like that and he would never talk to another woman about us.. he’s a good man. I know him. He just doesn’t think it’s suspicious that she always sends selfies… I believe he didn’t cheat but I feel like she was hoping to become more than friends with him. She knows about me.. she knows we have kids and have been together a long time. It’s WEIRD. I would never send selfies EVERYDAY to a married man.. (also.. I would never talk to a man who sent me selfies daily 🙄🙄🙄)

***he knows her from an old job***

Is it fair that I ask them to talk somewhere their messages don’t disappear after 24hrs?? My husband isn’t fighting it but I’m hoping you guys can tell me if I’m overreacting..