I found that my boyfriend had sent some texts to another woman saying he missed her. Context is that he has known her for years - they have the same friends and he met her well before me. She is married and has a child. In the text he wrote
'I'm ok I just miss seeing you ;-) anyway I hope to see you sometime'
I immediately felt that something was going on and confronted him about it. He swore nothing was going on and that he misses her as a friend because he hasn't seen her in a long time. His body language didn't give away any signs that he was lying. He also said that to miss seeing someone is different than to actually miss them.
Any texts from her to him that I've read did not look suspicious in any way. But his text to her did look a bit suspicious I felt.
But still I don't know how others would generally have reacted to this and I'm confused.