Sorry this is a long one, but I'm really upset and need some clarity.
DH and I have been together for 9 years, married for 5 and have a DD(5) and he has a DD (DSD) from his previous marriage.
DH and his EXW split 10 years ago, she kicked him out and moved a friend of his in, who she married and had a child with. They are apparently in a very unhappy marriage (as told to me by a few ppl including DSD) and she has started to contact my DH in what I deem to be an inappropriate manner - especially given that she has made it known that she still has feelings for him and "wishes things were different".
She messages him on WhatsApp every couple of weeks in what I think is an overly friendly manner (they aren't friends and he has no feelings for her at all, so he says and I have no reason to doubt him - their relationship broke down because she cheated a lot and just wasn't a very nice person and he says he would never go back there). She sends him selfies on Snap Chat which I think is weird and she friended him on Facebook though she doesn't actually contact him on there (I know because I check as I have his password, which he knows about and is happy for me to have).
It's all making me feel very uncomfortable given that she detests me and acts like I don't exist (due to a falling out a few years ago which resulted in DSD living with us permanently).
Last night we went out for his birthday tea, and I asked him had he had many texts wishing him a happy birthday (I was giving him the opportunity to tell me if she had messaged him) to which he replied not many, just two off his friends (not from her) and a few Facebook posts (also not from her). I didn't probe as I assumed he would just tell me if she had been in touch as he knows how much it bothers me.
Fast forward to this morning, I had a dream last night that they had been messaging and getting very friendly (yes I know, I obviously have a problem/self esteem issues) so I checked his phone when I woke up and found an "archived" conversation in WhatsApp where she had sent him a birthday message (I snapped a picture because I'm intending to keep a log of all the inappropriate contact just in case). I was so upset I could barely look at him, I told him I was upset that he had lied to me and he just said that he hadn't lied. I text him when I got to work this morning to say that I wasn't upset that she had messaged him, because I knew that she would (she obviously can't help herself) but I was upset that he had lied to me and then deleted the conversation so I wouldn't see it. He replied that she hadn't text, so I sent him the picture I took and he said it wasn't a text, it was a WhatsApp and he hadn't deleted it, only archived it so I could check it whenever I was feeling paranoid/ridiculous....
Am I overreacting? Am I reading too much into this?
It doesn't help that I consider her to be much prettier than me, much much skinnier than me and they have a lot of history which she has admitted she isn't over.
WWYD? Do I demand that he tell her to stop messaging/snapchatting and he delete her off Facebook? Their DD is nearly 17 so they really don't need to be in contact over her do they?
Or do I just leave him to it and trust that he loves me and wouldn't give her the time of day if she were to pursue him?
I also feel sorry for her husband, who is off work with severe depression at the moment. I'm sure he would be devastated if he knew she was messaging my DH as much as she is.
Sorry for the epic post, I'm just really upset and needed to get it all written down.
Thanks for reading (if you made it this far!) 