Why does my ex talk to me if he keeps bringing it up?

So a few years back, I had to contact tue police because my ex got so paranoid and his behaviour was erratic emotionally, he then started threatening to call police etc. So I reached out to the police to understand the situation I was in and they said he’s abusive and he was arrested. Fast forward to now, we have been talking for months. He’s been absolutely fine.

We’ve been taking for months and things are really good. But sometimes he brings it up and he said that his mum wouldn’t be happy that he’s talking to me?

Why does my ex talk to me if he keeps bringing it up?
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