Am I overthinking or is it actually weird that my boyfriend keeps teasing me about the one night stand I had with one of his friend back in 2018?

After I told him about my one night stand with one of his friend he just keeps bringing it up over and over again and not in complaining way but more in humorous way, he just casually laughs about it all the time.

What's going on with him? Any idea? Or am I just overthinking about it?

Am I overthinking or is it actually weird that my boyfriend keeps teasing me about the one night stand I had with one of his friend back in 2018?
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