Cocaine does make you horny apparently but ive also read that they release the urge of addiciton with porn/gambling etc, its so odd. I dont think it would make you more likely to cheat, but I know it doesnt make you think right and that it makes you selfish as hell as you know. Him saying other women are attractive etc is deceitful in itself to be honest as he is planting the seed.
I feel for you, so much. I have read your other posts, its horrendous. xx