1. When all the romance is out of a relationship but people are still in it because they are used to it.

2. When someone does something out of mundane habit, when he or she used to derive pleasure/happiness from it
"We've been together for 2 years now, but it's really because we're used to being together"
"So you're just chewing the popsicle stick now, right?"
by R-kon June 17, 2012
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