I’m wondering whether or not this guy is interested in me?

So basically this guy and I go to the same church, he is one year younger than me. Before this whole COVID thing, we volunteered in the church every Sunday. We acknowledge each other, however but never actually talked to each other before. Sometimes I would caught him stare at me, not only that but he also showed up at the place where I was. He tried to stand near me, and caught him looked deeply into my eyes once. The way he acted around me definitely inconsistent, he showed a lot of mixed signals, and my sister also acknowledged it too. She also saw him looked at me couple of times. Whenever I caught him looked at me, sometimes he would look away, but there will be day that he just didn’t look away or smile at me either. What he did instead was turning around to look at me when I walked past him. One thing that confused me was that once time while he was talking to his sister, he just kept looking back in my direction. Additionally, he stares at me but avoids me when I’m close. He runs away when I’m coming towards him but stares at me from far away. Why? For example, he pulled out his phone and pretended to text someone on the phone while walking past me. This one time, while I was talking and laughing at my guy friend’s jokes. He instantly put down his phone and looked at me, as I was about to walk past him. He instantly stood straight up, and started fixing his hair.

I really sure that he is a very shy guy that is why I always want to know the reasons why a guy would avoid/ignore me when I don't know him personally/ I did nothing to him and he pretends like I don't exist or he doesn't see me. He stares at me from a distance or when I'm not looking though
I’m wondering whether or not this guy is interested in me?
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