Why does my ex keep messaging me?

He keeps contacting me every once in a while but whenever I answer, he only talks to me for a day and then he starts ignoring me/stops answering. Why does he do this?

It's so mean. It keeps messing me up and it makes it hard to get over him. I never mention my confused feelings to him though.

It's been 6 months since we broke up, except for one week a month ago. It's long distance so it can't even be because he wants to just sleep with me.
Why does my ex keep messaging me?
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