Would if I regret leaving?

You flatter/delude yourself if you think love is enough to prompt an addict to take the cure. It isn't. You're on the money, tho, with your insight that leaving him - a sound move if only to protect the youngsters - is your only leverage in the matter. The reality is that if nothing changes, nothing changes. Paying lip service to a problem by either of you, as you know, contributes nothing toward the solution besides a lot of hot air. Your best move is to seek advice from family law atty. Bring yours and his last two or three income tax statements to help provide atty with a snapshot of the family finances and, most important, shut up about this visit. Tell no one. Addicts are esp likely to take steps financially to protect their source of supply. If this is likely in your case, atty may be able to freeze assets/bank accts to ensure the pool is still available to divide. It is highly unlikely substance abuser will even acknowledge the problem if you stay. On the other hand, it's highly likely children will learn that women tolerate behavior in men they know to be wrong/bad and worse, that behaving badly like pop is actually OK. Is this what you want? Of course not. So make the call. Even if you change your mind, you'll at least know what to expect in terms of separation and divorce. Remember, too, that there is no leverage in the threat of leaving. You have to actually do it. Do! Life if for the living - not the drop-outs.