Out of sight, out of mind or...?!
Question: Absence makes the heart grow fonder?
Answers: Absence makes the heart grow fonder?
Abstinence makes the donkey grow harder!
out of my mind perhaps
out of sight out of mind just joking absence does make the heart grow fonder
Honestly ... if the separation is by choice (one sided vacation or something) ...out of sight out of mind, because you have to be there for each other to keep it going. If the separation was beyond ones control (like being shipped out in army or something) then ... absence makes the heart grow fonder, because you should stick by them. =D