Am I too naive?

A very close friend of mine thinks I am too naive in relationships and that I need to grow up and learn to accept that people now don't care for emotions, love and blah blah. When I see different relationships around, none of them could stay for long. Even the best ones which I thought will never break up, broke up with accusations flying all around from both the parties. And in 90% of the cases, these people move on so quickly that they get another partner for themselves in a matter of few days. Probably he is right and he definitely had more such experiences than I had and he now repents for the fact that he got so hurt for people who in the end did not matter so much.
But, still I like that notion of love and relationships where there is a genuine concern for each other, where you trust the other guy so much that you give him or her the full authority to hurt or heal you. Most of the time, the other person hurts you but still you don't care! Today almost everyone who had been in a relationship had become too cynic of all this and refuses to believe that a good selfless relationship can exist. I still believe it can because I want to live with that notion and stay happy that may be one day I can find one!