Why does my ex always try to get closer to me after his break ups?

He sometimes contact me even though it's been six months after our break up. I don't mind he sometimes text me and wants to be friend but everytime when he broke up with his new girlfriend (he had already 2) he's trying to get closer. Like he contacts me almost everyday, how he still misses me and like me, if i don't wanna visit him to his city that he feels lonely there. (He moved there recently) ... He doesn't want to get back together but he's acting like he still loves me.

Why does my ex always try to get closer to me after his break ups?
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