I feel sorry for my boyfriend but i lose control with my ex’s cock.

My boyfriend keeps asking me what is wrong with me that lately i have become very cold with him. i do not know how to explain that the other day i fell again with the cock of an ex mine. the same thing always happens to me i promise it won't happen again but i end up messing it up. his way of fucking my ass by nailing it over and over and how he eats my cock makes me a vicious man with no control. it doesn't say no to anything even when i put the webcam on so others can see us.