How long do rebounds last for?

Until the next shot is successful.

My husband after 4months separation and 22years of marriage under his belt is in a relationship that's bin going 4 16months now.During this time he's fell out wiyh her 3 times and even got back with her after she humiliated him in front of his friends and family,meeting for the 1st time,with a drunken rage!also during this time he's bin coming back to me then bac to her saying he still loves me but can't 4give me.I had an affair and chose 2 stay with my husband .he couldn't handle things and moved out saying he needed time 2 sort his head out.from the moment he moved out he went out looking 4someone else until 4months later he met up with this girl who is similar to me except he told my daughter she's not has pretty as me!he's a non smoker and she smokes and she also smokes pot!worried if this relationship carries on and he wants my children 2 meet her?