I assume the expat fauna in Bangkok is quite the array of different characters, that 50 year old bloke sounds bad imo.
I've had similar things happen to me, people off their tits giving me coke or drone, the ringing me two hours later saying they'd run and if they could come over and do some of the stuff they'd given me. Twats
To be honest it also happened to me, being too euphoric and giving away too much stuff only to regret it once I was running low, at least I was never so shameless to ask people to give it back though, that's just low.
Anyway Pontifex, you're getting married, you have the next few decades to feel miserable and suicidal, try to enjoy your last few weeks of freedom.