Why does my ex still talk about me?

So long story short. We’ve been broken up for 6 years. Since then, he’s become a preacher, and constantly talks about me in his sermons. We’ve had no contact since the break up. But he preaches about how he wanted to marry me so bad. He even went to a mutual friend and told that person he would do anything to have me back/ make me his wife. We’ve both dated other people since the breakup and he was even engaged to someone at one point. Why won’t he stop?

Why does my ex still talk about me?
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