The grass is always greener on the other side.
More English Proverbs:
Don't fall before you're pushed.
Absence sharpens love; presence strengthens it.
A black plum is as sweet as a white.
Time is the soul of business.
Sauce for the goose is sauce for the gander.
Old praise dies unless you feed it.
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The world is a barrel, for all to draw from.
Everything comes to him who waits.
One good morsel and a hundred vexations.