Separation intensifies love, as in
After a year in another country she accepted his proposal, so I guess absence makes the heart grow fonder , or, used ironically,
The boss leaves earlier every day; oh well, absence makes the heart grow fonder. Although versions of this saying date from Roman times, it only became popular after Thomas Haynes Bayly used it as the last line of a song in
The Isle of Beauty (1850). The opposite sentiment is expressed by
familiarity breeds contempt.