Am I an enabler, or is he just a user?

Sociopath is correct. They derrive pleasure from conning people in a predatory manner. They get such joy. And their ultimate goal is to have a willing victim, and you have been that. They are charismatic enough to string you along until the parasitically move from one host to another. This seems to be the case. The charisma is faked of course. He could be a Borderline Personality as many are bi-ual or gay. They are very much the same as Sociopaths except in a feminized way because Borderline Personality Disorder is made up of 75% women and 25% men. A fair number of the men are gay. They have false charm and wear a mask, but self-loathe, some are cutters or self harm in other ways such as drug abuse. The level of criminality and emotional dysregulation is what sets Sociopaths and Borderlines apart. So count your losses and get this person out of your life with zero contact. You are only asking for it. Sociopaths hate to lose and Borderlines will keep coming back. If he makes restitution, he will feel entitled to come back and suck you dry again. So leave the air of ill will between you. It is like a "no vacancy" sign. You never really knew this person nor his true danger level.