Boyfriend mentions his ex randomly rarely on stories etc?

My boyfriend loves me and shows me lots of affection. He sometimes mentions his ex in stories or something we're talking about like a small topic. He doesn't do this often thankfully. It does makes me feel uncomfortable and weird, and i want to tell him this. Do you think it's weird or a bad thing he does it? I assume he just speaks his mind if something relevant comes

Boyfriend mentions his ex randomly rarely on stories etc?
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