I got a nosebleed while I was feeling very stressed about my best friend.
What was it that made you become so stressed while thinking about your best friend?
He promised me he would come over to study with me, but he didn't show up.
That's frustrating when you have a date with someone & they neither call nor show up. Maybe there were extenuating circumstances. Or the person is just rude. Either way, not your fault
I didn't call/text him because I already knew he would be a no show. I just used him to pay off a debt since I needed the money.
Well that can be upsetting when someone agrees to do something but does not do it. Just understand that the situation is out of your control, so all you can really do is move on.