What would make an ex bf want to apologize for something he said over 3 months ago?

My ex bf and I broke up over a year ago, since then, we've had a few months where we went out to dinner and to the movies a few times but nothing came of it. Back in February, we had an argument and he said some really mean things to me so I stopped talking to him altogether, no contact on either of our parts.... show more My ex bf and I broke up over a year ago, since then, we've had a few months where we went out to dinner and to the movies a few times but nothing came of it. Back in February, we had an argument and he said some really mean things to me so I stopped talking to him altogether, no contact on either of our parts. Then last week, I get an email from him out of the blue. The email was short and sweet and it was an apology for the mean things that he said over 3 months ago. Well, of course, I accepted the apology, we exchanged a few friendly emails and a few jokes. Then he suddenly stopped emailing. I am not really sure what to think of it. Any ideas?
Update: BTW..I had moved on....this apology was completely out of the blue and totally took me off guard and now I can't stop thinking about it. Moving on and no contact with him was very difficult for me and for him. So, I figured I was doing fine. I guess I just really miss him and getting an email from him was... show more BTW..I had moved on....this apology was completely out of the blue and totally took me off guard and now I can't stop thinking about it. Moving on and no contact with him was very difficult for me and for him. So, I figured I was doing fine. I guess I just really miss him and getting an email from him was shocking. He's not the type of guy who expresses emotions or apologies frequently or easily. So I was just shocked. Thanks to everyone for their advice! :)
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