Comfort

The more comfortable you become with someone the easier it is to lose a part of yourself in them. Its not that you don't want to get lost in this person, but you don't even realize that pieces of yourself are slowly dissolving. You become one person, not knowing where one of you ends and the other begins. Perfectly imperfect, your minds become one. Now you know how to play each others game, because you're playing against yourself. That level of comfort isn't something that happens overnight. It takes time; and arguments, and late night conversations, and emotional break downs, and tears, and once all of those occur the walls fall. Once those walls fall its all over. You are now connected for life, you're always in each others heads, comfortably living until the end draws near.