My (45f) partner (49M) and I have been together about a year. Let's call him Simon. Simon has kids with his ex. I don't have children but have taken his on when I moved in with him.
Before me, Simon was with his ex, let's call her Tammy. She left him and the kids after announcing that she had fallen for a work colleague and moved away. Her affair partner (let's call him Jeff) had a partner (Katy).
Simon contacted Katy and they were in regular contact as support for each other. They called a lot on the phone and went out for drinks. Simon asked Katy if she would be his girlfriend and she refused, saying it was too soon. They remained friends tho. A bit later, Simon asked again and Katy said she didn't feel the same way. He then joined a dating app where he met me.
We got on well and we got together. When Simon and I became official, Katy was happy for us. I have never met Katy and Simon hasn't met up with her or called her on the phone since. Katy has since reconciled with her partner.
Roll on a year and my partner still messages her sometimes. Not regularly, and less often as time goes by but they do sometimes message. Maybe once every few months. He asks how she is and she asks how we are. He always says we are good. General chit chat about kids and holidays, etc.
The problem is, I don't like it. In my mind, he wanted her at one point. And if it wasn't for her refusal, he wouldn't have been with me. Also, because he wanted her and essentially took her out with the idea of dating her and messaged and called her all day each day when they first became friends and for months afterwards, he had a major connection with her. This makes me feel like she is a bit like an ex. And lots of people don't like their partner still being on contact with their ex.
He doesn't talk about her and I don't think he knows that I know that they still message. Am I being unreasonable by thinking it isn't right to still be communicating with her?