What if a girl likes a guy and was deciding to leave her number for him But she finds out he is a jerk but still want to leave her number What should she do?

You need to ask yourself why you are so deperate to leave your number with a well-known jerk in the first place. Girl, get your priorities straight! You could biting off more than you bargained for. You appear to like the 'bad boy type' and trust me, it's an ugly road to go down. Life is hard enough so why complicate it.