Solitude can be terrifying. Or restful. Depending on the type of person you are. For those who recharge by being with people, the thought of sitting alone and spending time thinking seems an averse choice. Why sit isolated, caught up in the maze of your thoughts, when you could be surrounded by the love and warmth of others who understand? For those who recharge by being alone, an unoccupied room is refuge and an open field with no one in sight for miles feels like home. Each type of person shies away from the opposite matter.
However, there is not a strong enough word I can use to describe the importance of solitude. When you love someone, it's easy to want to be with them as a constant. However, in order to further that bond, there must be solitude. Solitude is where we come to terms with our thoughts, where the Lord can clearly speak to us, where we rest, and where thinking goes unrestrained. This must be protected at all costs.
To truly love someone is to be thinking of their needs above your own...even if that means protecting them from yourself in some fashion. It is a difficult task, but one that will eventually yield great reward.