My ex contacted me after 3 months?

niknac09
So the break up happened out of no where 3 months ago and then he completely ignored me it hurt so bad... this is what he said :

ex: "hey how are you?"
ex: "I wanna say I have been thinking a lot lately and I'm very very sorry for the way I handled things and all that. I don't know why I did but you didn't deserve that at all. I'll understand if you dont answer"

What can I say back to this guy? I don't want to sound like I care or that I'm still interested... but he did hurt me... but I want to say something with grace... ideas?
My ex contacted me after 3 months?
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