I have always been of the school of thought that distance can not and should not be used as a determinant factor of how successful a love relationship can be..... this is still my belief.
When two people are adequately in love, distance has no power over their relationship. It only helps in strengthening the love that exists between both parties.
All you need do is erase all doubts within you about your partner because trust is very essential.
In other words, as long as distance can be measured and love cannot, love will always, always overcome distance.
Wish you luck with your relationships!