I’m confused why he would say this?

My partner said to me acouple weeks ago “what if you were doing something behind your partners back and you knew it was wrong” ngl it’s been playing on my mind ever since. I asked him what he meant by it just now and he said nothing baby and he promises he didn’t mean anything by it. He is just scared of losing me. Proceeds to call me his one and only baby. I’m really confused why he said that tho. Would anyone be worried if a partner said that to you
I’m confused why he would say this?
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