Originally Posted by
rza1234 
Long story short, the last 3 days he was there I missed one phone call. Then he must have developed/realized feelings for this girl and he checked out 2 days early of a 14 day program so he could have his car for when she got out. He lied to me....
Sounds like you might perceive that missing one call caused him to stray.
If only you had made that call, all would have been OK, eh.
14 days is a blip in the recovery world. That he only stayed 12 days suggests he was not remotely serious about his own recovery. That's on him.
Use your time and energy to remain focused on yourself and your own recovery, the only thing you can control. Neither you or this other girl can cause or prevent him from relapsing. You are not that powerful. None of us are.