good idea, but I don't have time to get one

Ok, back from lunch.

His points:
#He has the reason for not paying right away and I don’t really need the money right now.
#So he will return the money back when he has money on hand. “It was your money. Of course I would return it.”
#He is tight-lipped about the repayment timeline.

I told him I'm a Mark Twain fan.
“I am more concerned about the return of my money than the return on my money.”------Mark Twain Quote

我看人能力极差. So I can’t tell if he has any intention of ever repaying it.

Should I trust him this time?
“Fool me twice, shame on me.” Should I give him the second chance?

Will he automatically return my money? I doubt it.
I guess when I am asking for it, he will make up lots of excuses and he will postpone and postpone. Just like one of my friend, after that I felt so ashamed to ask her my own money and decided to let it go. She has also happily forgotten about it.

Is it useful to ask him to sign a written claim in front of the Notary?

If I complain to DOL, it will lead to breaking of our friendship.