What is that overwhelming feeling when two people make eye contact?

This girl has shown interest in me and it’s been going on for a while; we have both been showing interest via eyes and have spoken a few times. However, we had a moment between us both and I felt this hot energy go through my eyes to my chest. It was an overwhelming feeling. This moment was a glance and we both made eye contact. I wonder what this feeling is. I looked at her again and she had nerves with feelings. She looked at me again when she was about to walk past me, but she was shy and looked away when I looked at her. She has been looking we me when she can.
What is that overwhelming feeling when two people make eye contact?
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