I found out a couple of weeks ago that my then fiance was having an affair for months. I found a letter not very well hidden in his sock drawer. I went mad. We had been together for 10 years and have 2 beautiful young boys. The woman hes been seeing is still unknown to me as he won't tell me her name or even if she's local. However he used to use my kids to go on soft play dates with her kids of a similar age to mine. That's what has made me the maddest of all. So now when he has a day off and I'm working, he will use my youngest (1) to go to soft play to see her. I don't want my kids to have anything to do with her. He wants me to sell the house (joint mortgage) so he gets his share of the money. I'm refusing. My son is in the catchment area for his school and I'm not putting a 4 year old and a 1 year old through that. We wouldn't make much from the sale anyway after paying off the mortgage. What are my rights after all of this?