Addicts/alcoholics lie and use people. It's what we do if still in active addiction or did when we were.
No matter how wonderful, giving, kind, sexy, beautiful and loving you are, the first love will always be the drug of choice....and the behavior that ensues in active addiction.
I know someone who got clean in rehab from heroin for three months. He checked out on a Friday and died of an overdose that Sunday. Unless someone is truly sober for a bit of time I wouldn't put any faith in their coming back to you. Abstinence does not equal sobriety, particularly if forced.