Let me start by saying that I don't care what ex does on his own time. That's his business.
The problem I have is that he brought her over without warning anyone and then let her stay over. On top of that, he had our 6 year old son share a room with her 2 year old daughter.
We have been separated for 10 months and just got the divorce decree last week.
I casually asked about who this person was spending the night with our son present and he refused to answer any questions. He also said that they were "just friends", but our 6 year old caught them sharing a bed together.
I told him I was uncomfortable with the entire situation.
Do I have a right to be upset about this? I feel like an introduction is one thing, but making the children share a room and having a sleep over hours after meeting is too much. Especially if they are "just friends".