He got so flustered when he saw me that he couldn't talk for a minute, what do I make of this?

This guy puts himself in places where he could run into me. He's a very confident guy who gets shy. I know he has a crush on me for more than 6 months now, but I want to understand how strong it is. He's a full-grown adult male, mature. The other day, when I ran across him, he was waiting for me by the water cooler. He got so flustered that he couldn't talk. He just blushed hard. I asked him a few questions and he just couldn't talk. This guy is seriously alpha so I was really taken aback. Is this feelings stronger than a mere crush at this point? I don't know him very well.

He got so flustered when he saw me that he couldn't talk for a minute, what do I make of this?
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