After breaking up, he changed his name, hoping to get rid of the past. He just wants to grasp the future now, hoping that the future will get better and better.

His attitude is that the old times have passed, and in order to meet the new and better, he should mean to let go.

This shows that he has a positive attitude. After all, you should learn to let go of the past.

It's that she gave you up completely and didn't want to start over with you. She wants to start over and forget her past friendship with you.

This girl thinks that attitude is to face tomorrow bravely, and now it's over and she's starting to welcome a new life.