This is the bare bones of an awful situation.
My partner wanted us to have a threesome. I refused for years. He kept on at me for years. I finally did it.
Myself and the other man have become very close, very very close. We have feelings for each other. Partner knows we are still in touch and is happy for us to sleep together again.
I'm falling in love, I want to leave my partner but I'm scared.
Help.