Why does my ex girlfriend call me when she is drunk to talk about the dumbest things?

Anonomos
OK so me and my ex girlfriend dated for a year and she decided to break up and I was ok with it because the rule is don't be with anyone who doesn't want you. So I carried it as friends not weeks but immediately after we broke. I don't call her she calls me drunk/sober just to talk. But my thing why call me at all? She called me on night at almost 12 AM to ask if Wal-Mart was still open. WTF?!?!. Also not to long after the break up she got mad at me because she said I acted like I didn't care that we were once boyfriend and girlfriend. What does that mean? And she also keeps asking do I have a girlfriend or am I single. I tell her that I'm having fun and that's it.
Why does my ex girlfriend call me when she is drunk to talk about the dumbest things?
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