Why did he stop talking to me all of a sudden? Avoiding me?

So this guy friend of mine has been avoiding me lately. I honestly have no clue as to why. We use to be really close, text every day and throughout the day, joked and teased each other when we saw each other at our local hang out spot.. now its all gone and it's extremely awkward since we both go hang out there alone. I catch him looking and glancing at me, ESPECIALLY if I'm talking to another person. He down right stares if it happens to be a guy. Most of the time he'll quickly look away. I have tried to talk to him as he is leaving but he will literally scurry to his car and drive off immediately. I'm too awkward to approach him because I don't want to come off weird. I'm giving him space but I miss him so much. What do you think? Is it too weird to text him that I miss him and his humor? Will that scare him? Think I'm too much? I don't understand what is wrong.
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What are some NON SCARY things to text him? He's already freaked out, I don't want to make it even worse!
Why did he stop talking to me all of a sudden? Avoiding me?
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