DH and I have been together for 15 years, we're early 40s and have two kids. Everything is in good order. Yet he has a (female) friend who I am jealous of. They've known each other since uni and she's just...that sort of perfect person, who is all of the things I'm not. We don't live in the same town as her, and she also seems to be happily married with kids. She and DH only see each other once every 3-6 months, they'll go for a couple of drinks and that's it. Occasionally we do something together with the kids and partners but mostly it's just them.
DH has describer her like a sibling. There was never anything romantic between them (going back more than 20 years at this point) and I don't have any reason to believe anything is happening now. And yet, if they're out together I find myself fretting and looking at the time and wondering where DH is. I'd like to not do this!
I don't have this with his other friends. I am well aware that people can carry on affairs whilst things seem fine at home. And that people can have fully platonic friendships with opposite sex friends (I have a few close male friends who I've never seen in a romantic light). And yet I also just can't let this one go. Is there a reason? Is it my intuition telling me something is going on? Am I just being absurd?
Any suggestions here appreciated. I don't like feeling so jealous and insecure. (I did have a boyfriend at uni who cheated and whilst it did give me a bit of a trust issue, it was also a uni relationship so not all that serious).