My husband want to have a threesum with another girl to get back at me for cheating, will it help? or not?

he feels lke he needs revange or something and i couldnt watch him do the things you do in a three um with another girl. i know what i did was wrong and im trying to fix it and will do anything to stay with him. he said he loves me and wants to work it out because i make him happy and he loves me, yet hes having a hard time getting over it and doesnt know why i could do what i did but wont have with im with another girl there. i wouldnt be able to handle it. he said he just wants me to feel what he felt and feels. will it help our relationship or make it worse?