Life is full of losers who love to just mess with you, especially people who are successful, big, or strong. I think it comes down to one of two things: jealousy, or greed, or a combination of two. Sometimes they just do it for the fun of it (or sport as some call it).
Here’s my advise :-), always make a list of people that hurt you. Then sit back and wait for the appropriate time to get revenge. When they least expect it, go after them with a vengeance. Now, if you get a sincere apology, accept it and let it go. But if not, just wait for the opportunity and when it comes, hit ’em hard.