What does this mean if my ex texted me this?

It has been 6 months since my ex broke up with me. My ex randomly texted me today and told me he still "hasn't grieved what has happened the past 6 months" and that he has been throwing himself into work. What does this mean and why would he say that?
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i ended up telling him i grieved months ago and it was the most painful experience ever. we were engaged. worst heartbreak ever. i wasn't afraid to say it but i also told him i'm in a much better place now. he responded by saying he "good for you. i haven't. nor have i moved on." interesting. when he dumped me, he sure seemed very very moved on. i begged and he even laughed in my face and told me he was long gone and that i'd never be good enough.
What does this mean if my ex texted me this?
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