Apologies for not using the lingo. I have recently found out by looking at my husband's phone that he has a close female colleague at work. I have read all the texts (not that many and mainly about people at work) and his teams chat which is usually every working day they exchange around 20-30 messages just generally about work people or having banter. He has never mentioned her and she is younger and single. She seems to be one of his closest friend in the office and the group of friends he has often go out together during and after work to the pub. I am currently pregnant and my reaction has not been rational. I have confronted him and he assured me it just slipped his mind and he has openly let me read all the messages. The messages themselves don't bother me just the fact he didn't tell me. He speaks to this colleague the most via messages but not via calls.
The group of friends is a mixture of women and men.
Should I be worried?