Go through this article for sure...
Fighting For Space

Points to ponder :
1. No possessiveness/domination.
2. Enjoy and do what you love or atleast indulge yourself in hobbies...
3. Make the partner feel comfortable.
4. Give enough independence.
5. Spend some time away from each other[if required] which inturn helps to lessen the space between the two.

I just loved this sentence from the above article.
"Space is all about how you adjust yourself without losing the 'You' in the 'us'".