Why is my ex still messaging me?

So my ex and I broke up about 3 weeks ago, after a year together, it was a mutual decision. We didn't speak for the first week and then it was the odd text for the second. Now on the third week he is constantly messaging, and I find it very hard to ignore. I don't know if he is just missing me or what, but he is very responsive and it is now an everyday thing. I've been having doubts about the break up but I don't want to say anything incase he doesn't feel the same way. Help
Why is my ex still messaging me?
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