Guy asked me to buy poppers before meeting up and blocked me before I even got to his place. Was this some sort of scam or was the guy just flaky?

Pretty much the title. Guy told me to buy poppers before picking him up at his place and that he'd pay me back later since I don't use them. Went out and bought them, opened Grindr to tell him I was on the way, and he had blocked me. Wtf?