Is it normal for guy friend to say he misses you when you haven't

For sure this is normal, this is a common saying that friends tell each other when they haven't spoken in a while. Although it wouldn't hurt ask your guy friend if he has some feelings toward you (it doesn't have to be romantic or sexual).

Sure. I mean if you're wondering if he likes you, maybe for sure. But there's also no reason you can't miss your friend. I have a lot of female friends and I've missed them.

I've had guy friends say that when we haven't talked in a while, but never after just one day of not talking. I would find it clingy.

People tend to feel differently about relationships. One person usually is more emotionally invested than the other.

As a result, it's very normal for one person to say that they missed the other, while the other person never missed the other person.