Gag. Girl you do not want to attempt to “fix” this man. You’re repulsed, because your body is telling you not to get close for your own health. You can get UTIs from his dirty weiner and fingernails. Unless he has severe, SEVERE depression, he is making the choice to be this dirty. He won’t get better unless maybe you become a mother figure to him and baby him, wash his hair and clothes, teach him how to brush his teeth, make his dental appointments to reverse years of damage… Is that something you want? That’s fine if you do, I guess, but there are thousands of guys who smell good and will also buy you food.