how to deal with a breakup :(

I just broke up with my boyfriend of a year and a half last night. He was so amazing to me and treated me so well but I know I didn't feel the same about him anymore. I didn't want to be unfair to him and I didn't want to keep acting like everything was ok. I hate knowing I hurt him so badly and I can't stop crying. Does that mean I did the wrong thing? I am so confused but I know I wasn't happy in our relationship. Someone please help.