Make threats, unless you can follow through. Try to control or regulate your partner's drinking or drug use. Protect your partner from the consequences of his or her behavior. Nag, criticize, or argue over trivia. It doesn't resolve anything and usually makes matters worse.
Recovery can be a long, slow process, but it really is worth the struggle.
And you really can make it if you try. The only answer is a great big unequivocal maybe. There's no guarantee and no exceptions to the rule. The fact is that addicts usually don't change until addiction problems outweigh perceived pleasures or benefits. And it's harder to shift that balance, still, when someone that a dependent person loves covers for them, makes excuses, and helps minimize the seriousness of plainly destructive behavior.