What do it mean when a man keep bad mouthing his ex?

Anonymous
We have a child together, he’s a deadbeat though. Our son wasn’t even walking and he impregnated someone else. It’s a lot of messy shit on his end. Long story short he’s throwing shots at me on his Facebook wall and I know it’s about me and not his current girlfriend. He’s always attempting to tear me down but I’m not problematic, stay out the way and don’t even want child support from him... because he’d get unsupervised visits which isn’t safe for our child. So I’m curious why he’s mentioning me if I’m nowhere around and he’s happy and moved on?
He’s miserable
He’s a narcissist and mad he’s lost control and don’t bother him
He low key miss me
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What do it mean when a man keep bad mouthing his ex?
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