What does it mean when a guy says they miss you but then suddenly didn't contact you for three straight days?

Anonymous
We're not in a relationship. And I asked him a day before he said 'i miss u', I asked if he misses me and he said he don't know since he's very busy lately with his life but i'm not satisfied with his answer that's why i keep on bringing it up to him and then he said he misses me a bit. And then the next day, that is the time when he said he miss me but now he didn't even contact me. What does it mean?
What does it mean when a guy says they miss you but then suddenly didn't contact you for three straight days?
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