She was talking too loud now, shouting almost, and a long silence followed. Why...

She was talking too loud now, shouting almost, and a long silence followed. Why was she being like this? He was only trying to help. In what way did he benefit from this friendship? He should get up and walk away, that's what he should do. They turned to look at each other at the same time.
"Sorry," he said.
"No, I'm sorry."
"What are you sorry for?"
"Rattling on like a….mad cow. I'm sorry, I'm tired, bad day, and I'm sorry for being…so boring."
"You're not that boring."
"I am, Dex. God, I swear, I bore myself."
"Well you don't bore me." He took her hand in his. "You couldd never bore me. You're one in a million, Em."
"I'm not even one in three." He kicked her foot with his. "Em?"
"What?"
"Just take it, will you? Just shut up and take it.