Has anyone ever felt betrayed and how have you handled it?

i got betrayed alot, some people think that since im forgiving and hard to anger, they think they can walk all over me. some of my friends think its ok to screw with me for a year, and when i prank and start haring him and his family, he thinks its all my fault that it was me who started it. some i use volience to try and change them. some times it works.