How can she be so strong?

How can she be so in command of her emotions, with such fury, that she knows herself, she knows exactly where she wants to be in in this world, she knows what love is, and she knows exactly what she wants from me?  I can be emotionally strong for short durations, then collapse into a ball of tears.  She has this fury, this fierce survival instinct, that is magnetic and intoxicating.  I've never felt anything like it!  Maybe this is why I need to be with her.  It rouses my ire, my will to survive.