This older man has acted different around me for over 3 years; is he shy or interested? If the latter how can I ask him out w/out spooking him?

InfernalHare
I'm in an interesting situation. This was been a reoccurring thing between me and this older guy since 2017. I'm curious about him but am an anxious person myself. He seems super shy or something? Though despite us not seeing each other often at all he consistently acts different around me.

From the very first time I met him in 2017, I was attracted to him as he's a very passionate and creative individual. Though at the time I had severe social anxiety. He would obviously stare at me from afar and smile, though once we sit beside one another he turns into a statue. I think he was trying to flirt with me bc he leaned in very close as if to say something to me and my anxiety flew through the roof and I bolted (stupid I know).

I only run into him during an event I go to every year (except for COVID) and I've been consistently surprised that he still gets flustered around me. For instance, the second time I saw him in 2018 he did the same staring thing and statue mode when next to me but I did notice he meekly tried to talk to me. It didn't even register he said something until retrospect and I felt like a total ass and he clammed up and didn't make eye contact w/ me throughout the night.

Then 2019 I was able to realize he might have a serious crush on me still somehow bc this time his behavior was more obvious. He was with his friends and was more relaxed. By chance he'd sat across from me and the MOMENT he noticed I was there he kept staring and smiling at me... to the point I wondered if he knew how to blink. I think he noticed I was anxious and he'd stopped but I caught him staring at me a gazillion times that night. I just figured he is a shy, awkward person but one of his friends loudly remarked "Hey! Why are you so quiet?" To which he immediately looked away and got quiet.

For context, English isn't his first language but I'm bilingual. I actually had a boyfriend in the past that spoke ONLY his language though. How can I ask him out if he is interested?
This older man has acted different around me for over 3 years; is he shy or interested? If the latter how can I ask him out w/out spooking him?
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