Husband's addiction

I just found out for the probably dozenth time that my husband is abusing medication again. This has been a struggle since weve been married for now 9 yrs. Every time I have stayed with him and helped him and forgave him. He's a good father to 4 boys nd a good person but this addiction is his biggest flaw. Am I wrong for staying? I have told him to be honest and that's all I need cause I can handle anything with honesty. He has lied every time this time a year of keeping this from me. He fessed up recently for the first time and I don't know what to do....we were trying to get pregnant but now I'm unsure. Help!!!