Does my ex boyfriend miss me or feels guilty?

My ex broke up with me on NYE, haven't had any contact with him since (3 weeks ago). But last night he messaged me randomly saying "Hey, you ok? Im so sorry for everything and how it ended btw!" I messaged back saying " Im good you? Ahh its fine dont worry about it" Then he said" But it wasn't fine was it?" Me "Honestly its fine" Then he replied " ok only if your sure, don't feel like it was fine tho x" I didn't reply back as i dont want to talk about the break up anymore.

What does he mean by this? Does he miss me or has suddenly got a guilty conscience?
Does my ex boyfriend miss me or feels guilty?
Post Opinion