How do you do that thing...

How do you do that thing where you tell me I'm beautiful, but make me feel like I'm not beautiful enough for you in the same notion? How do you do that thing where you make me feel guilty and apologetic when I'm not even the one at fault? How do you do that thing where it only takes one text message from you, containing bad news, to make me spontaneously burst into tears, as if you have full control of my emotions? How do you do that thing where you make me feel like I'm the luckiest girl in the world... invincible. You make me feel lovely and great. And yet, you do this thing where you make me feel like the lowest of the low, desperate, disappointed, and you make me feel like I lost it all over nothing at all. How do you do that thing where despite all of this, you make me stick around, make me feel like this is all worth it, you make me feel like I'm absolutely crazy about you, despite you not feeling the same? So tell me, how do you do these things when you know it cuts me to the core?