Well he came back...
BUT...

He got online (which I tried to prevent by changing passwords and whatnot ... maybe a bad move, but I'm tried of being the doormat)....and was talking back and forth with OW, as she was online!
HUGE FIGHT!
He has thrown himself like a 2 year old until I turned the computer and internet back on..... I just don't know what to do.
I know I have to "trust" but at this point there is no reason to trust anything....he is using my internet to talk to the OW he JUST told me he wants to go back to.....

ANY ADVICE?