At first, she thought that if she was with him, she would never be lonely again.
Later, she thought that although she would be lonely again if she left him, she would not be heartbroken.
Finally, she thought, it turns out that the person in charge has never been herself.
At first, he thought, it would be nice to be with her, with her fluffy little head, like a little rabbit
Later, he thought, leave her. It doesn't matter, I'm still the same person
Finally, he thought, it turned out that his heart was no longer under his control.