I legit had a feeling this was the case.
From what I remember you posting a while back, he was a good dude for the most part. Well as a fellow ok-ish dude, I'd be willing to bet that shyt hurt his ego. When you willing to cuff and she not...that shyt can legit hurt. So now he's in a situation where he knows he's kinda flipped the script. You ready to cuff and he holds a bit more cards on the table. And he gonna milk the shyt.
Also sound like he the jealous type. Probably makes him uneasy because if he knew the situation, he knows you can easily find another dude get intimate with, so he's on edge. He probably wondering if you even serious about getting serious.