What does it mean that a boy likes my personality, but he says he doesn't like me.

That means his feelings for you are not very stable. He sent you a text message to show his concern for you, but he said he didn't like you. Maybe it's an illusion. Maybe he doesn't know his own heart, but I think you should know yourself and have a serious talk with him. It's best to talk when there are only two people. You can show your attitude first, then look at his performance and imagine for yourself. Oh, I'm sorry, I can only help you so much.