My ex-girlfriend who broke up for almost a year suddenly sent me a message apologizing.

If an ex-girlfriend who broke up for almost a year suddenly sends you a message to apologize. Then I think it is very likely that he didn't live the life he wanted during this period and this year. So in this year, he is likely to recall your kindness to him. Then he can't meet such a good man, and now he just can't help but get back together with you on his own initiative. I apologize for this situation, so I think he really wants to get back together with you, otherwise he wouldn't do it.