I will not detail any real-life scenario here. But I will put it like this : People tends to take for granted the things what they have already… - A jobless person takes for granted the support his/her parents are giving him…
- An eligible single bachelor takes for granted the job which is providing for him…
- A married person often takes for granted the love & dedication of his beautiful wife whom he chased so much once…
- A married person with kids takes for granted the emotional needs of his/her partner, since the child/children are their sole focus point…
I tend to remember Sansa Stark’s quotes in GOT - “I am such a foolish girl…I never respected what I had…” 
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