Take the stuff u packed and go to your mom's house. Now.
No signing any lease with your name on.

Wether you are addicted or inlove, there's no reason to subject yourself to misery. And this is exactly what you're doing. Subjecting YOURSELF.

If the love is real, and he continues on his road to recovery, you 2 will reconcile when he has healed. Love knows no space or time...

Take your stuff and go. Signing that lease will just complicate your situation even further.

You are miserable, do yourself a favour and take steps toward happiness.