I have a boyfriend..he doesn't want to listen to my sad stories...he just quickly changes the topic or just leaves the SMS like that...does he cares for me or...I need to know?

You need to talk to your boyfriend about his behavior, and why he doesn't want to listen to you. Is it because he has too much going on in his life himself, and can't handle sad stories? Does he feel helpless because he can't help you? Are you telling him the same sad stories over and over again? Is he simply not interested? Depending on his answer, you'll know if he's a keeper or not. A good boyfriend should be there for you, for both good times and bad. Unless he has a good excuse, he's not the one for you, whether he cares for you or not.