依依不舍 (yī yī bù shě): reluctant to part (idiom); broken-hearted at having to leave

On the day we graduated from university, after we took our last group photo at the school gate, everyone hugged goodbye reluctantly, and many people cried.

The train was about to leave, and my mother still held my hand reluctantly, reminding me to be careful on the road, until the conductor urged her to get off.

When the little dog was carried away by its new owner, it kept looking back at its original owner, its eyes full of reluctance, and its tail drooped.

At the end of our trip, we said goodbye reluctantly at the airport and agreed to go to the seaside together again next year.