I feel sorry for my boyfriend but i lose control with my ex's dick.

My boyfriend keeps asking me what's wrong with me lately i've become very cold with him. i don't know how to explain that the other day i fell for the dick of an ex of mine again. the same thing always happens to me, i promise it won't happen again but i end up messing it up. the way he fucks my ass sticking it into me over and over again and how he eats my dick makes me uncontrollably vicious. he doesn't say no to anything even when i put on the webcam so others can see us.