I've read about cases like that. It's still a form of manipulation. By saying that he'll die - which he knows you don't want - he gives you no choice. He has the power to stop what's happening, but he doesn't. And you can't stop it. That's abuse.
Abusers can be very loving. Sometimes, this is how they groom you to prevent you from disclosing your abuse. You don't want to tell on someone who loves you, therefore you don't. Perhaps he did love you...but having sex with a minor is a crime. He should know that.
Hope this helps, buddy.
You don't have to be perfect to be wonderful.