With people, who I called friends-no. I got disappointed by them, but mostly I thing because we stopped being friends.
In relationship - yes. Once I've been dating a guy, after half a year he said he can't be with me. I'm too fast, to impulsive ant to energetic for him. He left. After another half a year he contacted me and said, he never forgotten me. I forgave him and we were together once more. Then after half a year he had his senior year exams, said I give him too mutch stress and asked for a pause in relationship. Then we became colder for a summer, he went to university, some parties to meet with new fellow classmates.. And one day I ask "so, you wanna hang out?" and he said "I can't. I'm not single". He just... Find other girl and didn't even had guts to confess