this relationship sounds extremely toxic. i don't know if he is being real with you about wanting to work on the marriage or not, but the problems most likely won't be resolved in a few months. first thing i'd suggest is to stop giving him money. is he buying drugs with the money? he may well be. the fact that he is considering dealing drugs is terrible. he is physically abusing you and lies to you. it doesn't look promising to be honest. you could separate before you decide whether or not to give this a last shot. that way at least you'd have some peace. just know that he'll be on his best behavior until he wins you back and then who knows if he would keep it up. i'm sorry things have worked out like this.