A cliffhanger ending indeedā¦
Another explanation could be that he has the chance to meet you in person at the bar and negotiate the off face to face, which inspired confidence in agreeing to long time? Going to the bar in person, āinvestingā in the cover, off fee, mamasan tip probably indicated you were a serious customer as opposed to a random on FB that he has never met before. And he probably liked what he saw as well.
Think there are very few boys who would agree to long time just based on first FB or Grindr chat.