Guys, What does it mean when an ex sends you a message saying 'have fun in your new relationship' ?

Anonymous
I updated my Facebook relationship status and then my ex sent me a message saying 'Have fun in your new relationship, I'm sick of having feelings for someone that doesn't give a fuck about me'. Him and I didn't part on the best terms, we broke up about a year ago. What does he mean? What does that message mean?
Guys, What does it mean when an ex sends you a message saying 'have fun in your new relationship' ?
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