Why did he lock eyes with me?

Me and a coworker were chatting and he was flirting with me sorta (everyone thought we were dating cause of our chemistry). Then this other man came near us and me and the other man couldnt stop staring in each others eyes even while the first guy kept talking to me. I was smiling also. Its just weird that we couldnt stop locking eyes.
Why did he lock eyes with me?
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