I made my boyfriend feel betrayed, how can I reassure him?

Anonymous
I have an ex coworker that was one of the only people I get along with at work and we text sometimes, I tell my boyfriend what we talk about most of the time. He made an inappropriate comment once and while I wanted to tell my boyfriend about it at the time I ended up forgetting about it. If you're curious we were talking about fitness and I said I was a little overweight and I was considering signing up for a gim and he complimented me in response. I felt it was weird and changed subject then. Today my boyfriend wanted to look through the convo and I let him because I don't have anything to hide. He got upset when he saw the message. He tried to play it off as nothing but I can tell he feels betrayed. I feel so bad because I never intended to do hide anything but I understand him. I don't know how to make him feel better, I feel so bad to see him hurt I could cry. But when I try to talk to him about it he just pretends he didn't actually care and was joking when he reacted. I know he wasn't. Earlier he said that me trying to reassure him so much makes him think I have something to feel guilty for. What should I do? I know it's horrible to suspect being cheated on and I don't want to make my boyfriend feel that way when I would never ever cheat on him
I made my boyfriend feel betrayed, how can I reassure him?
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