He may be poly, but he's definitely full of shit.
You made it very clear that you needed to know when he would be sleeping with someone. You made it clear that it wasn't trust or jealousy issues and that it was a safety thing. He has consistently lied to you about that at least 3 times that I remember without rereading the post (roommate, random blowjob, woman from high school). I wouldn't have a relationship with this guy, personally, and I would definitely NOT be having any kind of unprotected contact with him.