I did it once, and only in the last 2 hours, as I was going right to a concert with Slayer, Lamb Of God, Amon Amarth, and Cannibal Corpse at Ak-Chin Pavilion in Phoenix.
He blocked you once. Who's to say he wouldn't do it again.
As for WhatsApp- that app is chock full of scammers. If you met him on there, it may not even be a real profile. I wouldn't trust any of those apps as far as I could throw a semi truck.