Why does he keep sending relationship videos when I’ve said I’m staying single?

So i do admit that I have talked to him a couple times about my ex, but when he send these videos about relationships whether about finding someone better, not letting anyone treat me this way or having kids and raising a family, it's not around the time I talked about my ex. The guy's not interested in me, and I keep telling him that im staying single.
So why does he randomly send videos about men and women's relationships? None of that applies to me.
Why does he keep sending relationship videos when I’ve said I’m staying single?
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