You probably don't have the energy to go through this again.
In dealing with a serious addiction you need to protect you hone, assets and children. Take those steps.
If you want a divorce, move forward.
If you want to save the marriage, then it's time for an ultimatum and serious, hard demands: marriage counseling, AA, no contact with OW. If he says he'd rather pluck his eyes out than go into marriage counseling, then tell him you would rather be divorced than live with a drunk who cheats on you.
