Went through a similar unpleasant experience with a brother who lied about why he needed the money and then refused to pay it back even twelve years later when I was out of work because he didn't "think I needed it". Great logic! I made a nuisance of myself. Called nightly and sometimes twice a day when he missed an agreed upon payment. I got it all back. Then learned that he owed money to three other relatives playing one against the other - "I can't pay you because so and so is demanding payment." We all fell for it. Once I got paid, everyone else followed suit. He did it because he could, not because he needed the money. There were trips to the Islands and a new 4 wheel drive affair. Sad - he refuses to speak to me anymore - I am the bad guy for making an interest free loan for twelve years.
Two comments - if someone is truly considering suicide, a loan is not going to change things - that was a ploy. And i never lend money anymore. If someone needs it and I choose to provide it, it is a gift. I don't want the responsibility of collecting it.