Tough lesson

Not everyone is going to treat you how you deserve to be treated. You have to accept that. It's a tough lesson to learn, but once you learn it, you will treat others better. You should, anyway. You never know what someone is going through. You never know who's apology they're waiting on, why they're waiting on it, or how long they'll have to wait. Just apologize when you have to, always show kindness (or at least decency), and don't let someone who hasn't learned these lessons hold you back.