No "I Love You" Back?

On my way up the third floor, a student says "Hi Teacher,  Bye! I love you!"

And hastily, I answered, "Bye! Take care!" I meant every word sincerely, mind you.  And my student asks me, "No I love you back?"

"I love you! But you know that already, right?" I asked.  

"Yeah," she answers. "Take care, too! Bye!"