personally mate he kept knocking you down on what seem's a good motor and he's just given you grief for it after he's the one with no respect esp towards you i'd of personally told him to fuck right off a long time ago, i think you have been more than helpfull in all accounts i wish more people like you sold stuff but then again i don't think it's exactly what you want to be doing.

in a nut shell i think he's just mugging you off mate and i'd cut all ties and tell him politely to do one, nothing more to discuss as you have been overly helpfull and he's just messed you around tbh