My self-esteem just got crushed by my ex girlfriend. While I was serious about her and actually wated a long-term relationship she never planned to have an LTR with me, yet it lasted 18 months. She also told me the sex was bad (I can believe that, she took my virginity and I'm not very in shape yet). With most people I don't care what they say to/about me, but this really hurt. I know I should learn how to be happy by myself, but appearantly I got a lot of validation from being in a relationship. So how can I start improving myself?