Is it a red flag if boyfriend keeps talking about his toxic ex over and over and over and over again?

He's mentioned her 8 times in 5 conversations. She cheated on him multiple times, and I get it that that was very traumatic. But a part of me thinks he'd never love a woman the way he used to love her. Thoughts?

Is it a red flag if boyfriend keeps talking about his toxic ex over and over and over and over again?
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