DH has a female friend who he spends a lot of time with. They are working on a joint project together in their spare time, and e-mail each other several times a day and meet up 2-3 times a week. Sometimes we all meet up and our DCs play together.
She has an unhappy marriage, has told DH that she doesn't sleep with her husband and that they don't get on. We had been through a rough patch for about 3 years prior to this but had just started getting on again when she came on the scene.
Now I feel jealous of their friendship, DH used to be my best friend now it feels like he's got a new best friend in her, and I don't have any other best friends. Their joint project is a real shared interest for them, but DH and I don't seem to have any shared interests these days and have little to talk about apart from the DC's, and I feel sad about this.
I'm also concerned that their friendship might develop into something more, especially as she has an unhappy marriage. DH assures me that he would never be unfaithful to me and I believe him, but I'm still jealous and concerned about where it might lead. Am I overreacting?