he said it wasn’t about the sex anymore, it wasn’t even that special, with me it was more special but he was willing to give up on good sex if he had that “calm” feeling he experienced being with her.
What a load of gas-lighting BS.
You deserve so much better than this, but it will take time for you to see it. One day you’ll re-read this and be filled with rage that a) he did this to you, and b) that you allowed it.
I can’t recommend highly enough that you immediately seek professional individual counselling or psychological support.