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Two people need to be comfortable with who they are before they can be a full partner to someone else. A partnership works best when both individuals are solid and strong on their own, and look to make a 'better' situation by going together. If the partners are only together to run from something else, or neglect what they need personally, then things simply aren't going to work well.
Of course, every individual needs a different amount of space to be content. It could be that the amount you need is to your partner not 'space' but 'separation'. And indeed, sometimes when people look for space they really want to get away from their partner instead of just in towards themselves. Really think about why you want distance, and then talk to your partner about his/her concerns and the whole situation. Hopefully you'll find a compromise!