My ex-boyfriend also sent me messages, caring about my position.

It means that he still thinks about you in his heart. Maybe he thinks he still cares about you after breaking up with you.

I don't know why you broke up. Your ex-boyfriend should still like you or care more about you.

If it can be said that he wants to get back together with you, maybe being with you has become a habit of him.

So I still send a message to care about you, and I still want to know how you are doing and how everything is going, so as to reassure him.