My boyfriend got sad when I told him he's better than my ex?

My boyfriend of 3 years randomly asked me why I chose to date him, and I said that he's better than my ex. My ex was extremely toxic and dumped me for another girl on my birthday, but this was a long time ago. After I said he's better than my ex, my boyfriend was like, nothing more? To which I replied, yes ig that's all? He became extremely sad about it but I have no idea why. Did I screw up? If yes, what can I do to rectify my mistakes?

My boyfriend got sad when I told him he's better than my ex?
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