Dude us rather insensitive. Why telling ex girlfriend that he “needs sex”. That’s totally uncalled for. I think him blocking you might be a blessing. You don’t need this guy in your life. He needs to be gone. His mental health is his concern plus who really knows what’s going on. You gave it a try but he’s not the right person for you. You sound very caring and you deserve a kind person, this guy isn’t it.