As someone who was in kinda similar situation, receiving break up, but recovering relationship.. I don't get it. They like each other. He is willing to work off his debt (in case of failure). But she doesn't want it. She doesn't want him to change (for her) Like. I get that it's late, but breaking things one-sidedly when the other part is ready to change sounds selfish to me. I would understand her if she had feelings for another person, but it still seems like she likes her ex significantly more than her colleague. It's like she doesn't believe in him and doesn't think that giving him a chance will result well, or, just as she said, she likes him when he isn't struggling, when he is carefree, which is.. a bit superficial?
It's nice and realistic manga, but it's becoming hard to read for me, since I still hold grudge against bf for sudden break up, even though we're in even better relationship rn.