Why do guys stop putting in the effort!??!?!

why is that once a guy thinks he's got a girl for good he doesn't try as hard anymore!? like the guy I've been dating is really amazing and the first few months we were talking he would always text me and call me and do all these cute things to please me, but now 6 months in he's stopped. no more cute texts no more phones calls or cute facebook comments. I don't understand is just me? because I feels likes he's not putting in that effort anymore!? why do you guys do that? insight would be nice as to what you guys are thinking about once you've got a girl and feel like you don't have to make an effort anymore!?

Why do guys stop putting in the effort!??!?!
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