Why do women hate it when a guy says "you'll never find a guy better than me" or some variation of it?

I've heard more than one woman say on this site that it annoys them when guys say this. Why? I mean if you know he's not right why would it matter? Is it him saying that? Is it the relationship has ended and you have enough doubts already you don't need him adding to them? Or is it that you're bothered by him insinuating at this point he knows what's best for you. Or is it just the insinuation. That you somehow peaked with him?

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Sorry ladies I should have made this gender specific.
Why do women hate it when a guy says "you'll never find a guy better than me" or some variation of it?
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