There are those for whom... for various reasons, the pain is part of the pleasure. Those that need the pain. He may be one of those. But what he does, he chooses to do on his own, of his own free will. You can not take responsibility for the actions of another, or you're denying him that free will.
Perhaps he does avoid, but to assume he will before the fact is like crying over spilt milk while it's still in the cow. What he does he does because of himself, not because of you.