Does it mean anything if a guy keeps your number after you stop talking?

Anonymous
If you haven't spoken in over a year, spoke on the phone once(I never kept his number) and he asks for your number out of the blue because he lost it, does that mean anything? Or am I just over thinking it? He had told me before he didn't like me, but why keep the phone number of a person you don't like and never talk to, let alone ask for it again?
Does it mean anything if a guy keeps your number after you stop talking?
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