Intelligence: I agree with your points. Gibran's message does convey the concept that we love someone more when we are far apart from him/her for a while. Thus, distance (which is a separation even though the people will be reunited again one day) does make the heart grow fonder. Some time away is good because it allows us to think and feel what we did not know of when our loved one was in our presence, in the case of love.

I think Gibran's message here is quite simply translated as: 'you don't know what you have until it's gone'. His use of the word "separation", I think, is not necessarily about breakups, it could also be seen in the light of 'absence makes the heart grown fonder'. Sometimes we need that 'time out', absence, separation to truly understand the depth of our feelings/emotions, in this case, love.