Being friendly with his female coworker?

So, my husband was talking to his female coworker for about an hour maybe an hour and a half yesterday. I heard them talking ( he was talking in the living room and then went to the bedroom). But I heard them talking about work stuff, movies they like, and tv shows and bunch of random stuff. When I came inside the bedroom I was giving him the look like hurry up and get off the phone phone they’ve been on the phone too long in my opinion. But before they were talking on the they were texting. Like sending voice messages. But from the voice messages I heard they were talking about work. So they were talking and texting within that maybe an hour and a half time frame. But as he was talking on the phone he was laughing a lot at what she said ( but in my opinion I didn’t see nothing funny ) But I really feel some type of way about that. I really don’t know how often they talk because I work night shift. So when we had dinner I didn’t talk to him. I just stayed quiet. He kept asking me what’s wrong, Are you mad at me. But I did say anything. I didn’t want to say anything at that point. Maybe I’m over thinking it and being a b^tch in the situation 🙁

I didn’t want to talk to him about it at first because I thought I was being ridiculous… or paranoid