Mine has done this to me on more than one occasion. I don’t think they meant to do it intentionally to hurt me. I think they were just thinking of me at the time.
I saw and felt everything through his eyes for a few moments while it happened, and I was utterly repulsed. She’s his karmic partner, or the third party. Not someone I know personally, but I can’t stand the negative energy I sense off of him because of her. I’ve struggled with this and still feel resentful. I know I should be working on that I think I understand what a karmic is and technically I know she is there just to help him learn a lesson to be ready for union and more but… it still hurts. It is one thing to know that logically and then deal with the emotion of feeling him connect with her.
Also, having to work on forgiving him for the situation. If he is going to sleep with her I don’t want to see that, keep that to yourself.
Trying to explain this to him might not work, as he may not understand. A few months ago, I performed a contract-ending ritual regarding her, which seemed to help, but he still hasn’t told her to leave him alone. He was thinking of me while being physical with her, and while I realize this is a lesson and a healing opportunity for me, he would probably deny it if I confronted him.