Warm
How he could he keep going back to her again and again?
It was a good question. One he didn't answer when Dee asked it of him before she walked out for good, but one he'd thought about a great deal since then.
Why did he keep going back to Kara again and again, even though she kept hurting him?
Warmth.
Her touch was the only thing that kept him warm.
She was like a flame that continually drew him closer. She fascinated him, mesmerized him ... caused him to lose control of himself. And yes, even burned him many a time, but without her his life was cold and empty. And though cold and empty had seemed like a good idea at one point - at least he wouldn't get burned again - he'd soon realized that without warmth he was like a block of ice, cool, unfeeling and uncaring about anything.
Her touch warmed him from the inside out, igniting the spark of life within him.
Without it he was nothing.