Why do guys become too comfortable when the girl is always available?

What I mean by too comfortable is you don't text or call like before. You don't seem eager to see her like before. Even if you share much love this happens. You start being busy all of a sudden. It's like she's already mine why make any extra effort to please her?

And Here what happens: when a girl treats you the same way. Doesn't reply soon or call, you start worrying and you call & text immediately. When she puts you on your toes making you feel she's not for granted, you start waking up from the comfort zone.

Why you do that?
Why do guys become too comfortable when the girl is always available?
Post Opinion