Time and distance don't always change everything if bot parties can work out an agreement or commitment, however, most couples cannot since they don't have same goals.
I think love is something which happens immediately, you don't know it until it's in your heart. And it's not accumulation.
The following is my favorite word about love:
Love is patient and kind;
It is not jealous or conceited or proud;
love is not ill-mannered or selfish or irritable;
love does not keep a reocrd of wrongs;
love is not happy with evil, but is happy with the truth.
Love never gives up;
and its faith, hope and patience never fail.
Love is eternal.
Meanwhile these three remain: faith, hope, and love;
and the greatest of these is love.