Probably the first rich good person I’m close with But you can’t lend anything to this guy. He just forgets about it and lost it .

And that's a valuable lesson that you're lucky to have encountered so early. These kind of rich ppl? They are also assholes. They're so cincai because they never have to worry, but also because they know, even if they can't articulate it, adat/politeness means ppl are unlikely to ever demand something like this, because malu/segan. Always ask back for what you're due - he's probably going to kutuk you (in that careless cincai rich guy way and he probably "didn't mean it that way") behind your back, but fuck that shit, and fuck that man.