Hello, my DH (together 13 years, married 3, mid thirties) worked at a company in 2015 for one year and made friends with 3 people in that time that he kept in touch with after he left. This was when we lived together at my parents house and the company was based in the same town. We then moved away 2-3 hours drive. We go back fairly regularly to that town for holidays and stay with my parents (it's where I grew up and where all my friends are too). When we go back he will often meet that group of friends and have dinner/drinks as a four.
One of the girls in the group I cannot remember him really ever mentioning during his employment at the company but has taken to messaging my husband privately outside the group chat to ask him to meet up with her 1:1 in addition to the group meets, or in lieu of if the group aren't free. He's done this a few times and he has gone on walks with her around the town where my parents live while I'm at my parents house.
I've never met any of these friends and have asked but he said he would find it weird to bring me (another girl in the group has a husband but never brings him).
I know it's irrational but my gut reaction every time he tells me she has messaged to ask him to meet and he goes is uneasiness. I've never expressed this to him as the meets are infrequent as we don't live in this town anymore. However, we are TTC and hoping to move back to be close to family and friends. I think unfortunately this anxiety is just part of who I am and isn't a reflection of his trustworthiness; this is just how I feel in these types of situations because of my own experiences growing up, which is why I haven't said a word to him about how I feel. But today, as we are back over the Christmas period she has sent a message asking him when he's free for a walk in addition to the group meal they are doing tomorrow.
I am just wondering if I should try and talk to him about this, mostly due to my worries about how this could play out when we move back. In an ideal world I would prefer it if he just kept their meetings to the group situation.