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It has to happen. When you stay somewhere too long, more like you start thinking the limits of that place or your limits too, so maybe you are not lazy or uncomfortable, maybe the job, that relationship is it to all the people around. Just aren't giving you much room to become intense.
I've seen people completely change after changing their environment, new surroundings, pull a version of you out that you didn't even know was there.
No joke, but this is a serious situation I've always observed within my environment.
It seems so weird, but that's how it has always been.
Most of the time we don't have nothing to do about it. Maybe it is just our mental condition that is always affecting us.