There are differing versions but the one I always liked/knew was: -
If you love something, set it free.
If it comes back to you, it's yours
If it doesn't, it never was...
I am directly quoting George Carlin when I say this, "If you love someone, let them go; If they come back, set them on fire." I know it probably isn't what you're looking for, but I always thought it was hysterical and had to take the opportunity when it presented itself!