Why are shy guys so inconsistent and confusing?

Anonymous
This shy guy who is maybe 5-6 years older than me acts as if he likes me. I can go through a list of how he acts and the signs that likes me but I won't. We've never spoken and just recently he started writing me messages on his phone and passing to me. We started passing mesages to each other for 2 days that way and chatted verbally after that. But why is it when we meet again the next day, he don't talk to me but just smiles and stands =+looks at me on and off regularly. sometimes I catch him looking at my phone when I'm watching a video, scrolling through my messages and looking at pictures but he quickly looks away after. Then after the awkward "i-look-at-you, you-look-at-me" moment in the train, when we get off, he waits for me by slowing down his pace and when I finally catch up with him, he finally talks! Why not start talking in that one hour of awkard silence but starts talking when we start walking?
Please tell me what is going through a shy guy's mind when he behaves that way so that I can understand him more. I'm sorry to say but it's frustrating for a girl when guys act that way because its like so inconsistent and sending me mixed signals
Why are shy guys so inconsistent and confusing?
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