Expansive

 "Is there a reason?"

"No"

"Is there a why?"

"No"

"Then how do you know? How do you know it's love?"

"Because you can't put the feeling into words. You can't, no matter how many poems one writes or whatever love songs are sung, you can't describe it. And that's how you know. If you try to rationalise it, put reasoning to it, you are denying that some things just happen. They just do. These things are beyond our control. Who you love is beyond your control."

"So if I ask, 'why do you love me?' That's futile?"

"Of course! That's limiting love, why would one do that? Limit something so expansive, so comforting and wonderful?".