My ex-boyfriend broke up for a long time and apologized to me yesterday. What kind of psychology is it?

For her long-lost predecessor, she found herself and apologized to save her feelings. Maybe after he left you, his love life was not satisfactory. I might as well miss you after thinking about it. If he finds a suitable girlfriend and lives happily, he will never contact you. After all, you two dated, and one of you had feelings. Apologizing to you is coming back to pursue you.