One vague question: How can people live with themselves after hurting someone? :(

You first need to take into consideration the situation. We don't all know how much we've actually hurt someone, and of course they may never know how much their actions have caused us pain. The majority of us don't go through life intentionally wanting to hurt others (at least I hope not) but sometimes, sadly, that's the way it goes.

To sum it up we need to forgive, forget and move on. Life is a journey and will always have its ups and downs.