In middle school, I noticed that my desk mate dropped a ten-dollar bill.

I secretly picked it up and slipped it into my pocket.
After dinner that evening, I returned to the classroom and saw her leaning on the desk, quietly crying.
"What's wrong? Why are you crying?" I asked knowingly.
"I lost ten dollars..." she said with a tearful voice.
Seeing her so upset, I softened my heart and was about to take out the money to return it to her.
Suddenly, I had a flash of inspiration and, instead of taking it out, I put the ten-dollar bill back into my pocket, which was already halfway out.
I took out two five-dollar bills from another pocket and handed them to her.
"The ten dollars I just found in the classroom, is it yours? Be more careful next time." I said, placing the money into her hand.
She looked down at the two five-dollar bills in her hand, then looked up at me. Her eyes first showed confusion, then gradually softened, as if she understood something.
She smiled gently and said, "I understand now... thank you."
From that day on, she let me copy her homework, and when I read novels in class, she helped cover for me.
She also took the initiative to help me prepare my meals, and life became quite comfortable.