What does it mean when you see the guy that you liked an he turns his head?

When the guy you liked turns his head away upon seeing you, it could indicate a range of feelings. He might be shy, unsure of how to engage, or even trying to avoid an awkward situation. Alternatively, it could suggest disinterest or a desire to not interact. Ultimately, context and his body language in other situations are important to consider for a clearer understanding.