The moment your partner fell in love, he stopped thinking about himself as a singular unit and started think of the two of you as a team. You can tell when he has reached this level, as he'll always tell stories with the collective 'we' instead of the individual 'I'. You're so interwoven in his life and in his heart that he barely ever refers to just himself.
We know, we know - couples who do the 'we' thing can be kind of annoying at times! But let's face it, when you're a member of a couple who does it, it tends to give you a warm and fuzzy feeling inside. Knowing that you're one half of a strong partnership makes it a little easier to face the world. When you're in love it feels like you can do anything!