vujade made a very simple statement of common sense. I hope you do wake up tomorrow and read what you wrote...and get yourself into reality.
Maybe it is best to let your son's father raise him for the next few years, don't jerk this poor kid back and forth with kick the BF out/make declarations to your son/ retract/ bring the BF back in/talk about his librium recovery treatment/lather/rinse/repeat.
Another simple thought....would your son treat you this way? The old do unto others saying....I'm sure he must feel bad that you chose your ABF over him, especially after he confided in you how bad it was before.