Love is a really funny emotion...
My mother is a firm believer of the whole "If you love something set it free. If it comes back it's yours and if it doesn't it never was" thing. I would be a believer too, except that I know that sometimes people come back out of desperation and not because they feel they belonged to or were even part of that person. In this case, the coming back thing is the worse.
I also have a friend who shall remain nameless, who loves that saying but with a twist: "If you love something set it free. If it comes back it's yours and if it doesn't, go out, find it and force it into submission". Pretty creepy I think.
In any case it's kinda weird how neither of those sayings is healthy. In one, if you love someone you are suppossed to be a martyr and just hang around waiting as you accept a life of not knowing. In the other a psycho. Stalker, anyone? And neither of those things come with a guarantee either...
These days I've been thinking of the "if you love someone enjoy them when they are around because once they leave even if they come back, it may not be the same" approach. I think it's good because it leaves room for possibility all the while it's extremely honest.
And I think that goes for every kind of relationship.
That whole "distance [physical or psychological] makes the heart grow fonder" thing is nonsense. Distance changes people and sometimes makes them forget. Been there-done that.