Why would an ex still message me trying to get under my skin even though we’ve been broke up over a year, & he’s in another relationship too?

As far as I’m aware it was left on good terms. I was angry with him but I never took it out on him. I just moved on and focussed on my own life. He did speak quite bad about his ex when we were together though. Nothing bad happened, I just didn’t want to carry on in a relationship I started to feel more disrespected in. I started to feel more like a convenience so had a talk and decided to end it. That was all fine. But why is he still straining to get under my skin if he’s been with someone else for a while now, surely there’s better things to do? 🙄

Why would an ex still message me trying to get under my skin even though we’ve been broke up over a year, & he’s in another relationship too?
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