Choose whom you give your love to carefully. You'll always have people in your life who will take advantage of your "niceness"; that being said, always treat people with respect, that doesn't mean you have to allow yourself to be completely involved (emotionally) with everyone.
If you try to be loving and good with everyone. You trust all of your friends, but in return you don't get that love or friendship and you always get hurt, what you should really do???
When you get older you live and learn. Yes, when friends hurt you well got to move on..it's not the end of the world..People who take us for granted aren't nice people..I have no friends cause i wish not to be back-stabbed..If i befriend someone and they hurt me i will back off.