nigga ill cut u

Sat on his bill --> All alone, with no-one.

Bill --> Billy Tod --> Cockney rhyming slang for "own" --> as in on their own.

Don't know why it is rhyming slang.

It matters not whether you win or lose; what matters is whether I win or lose.

You hit the nail on the head right there. For the most part the reasons people kill themselves for are things that could have been fixed. Suicide is the easy way out and the cowards way out.