What does this sort of eye contact mean?

I’ve noticed that when I talk with my crush, he will hold strong eye contact and stare into my eyes for a few seconds. Then he will look away for a short period, and keep repeating strong eye contact followed by looking away.

I've also noticed that his eyes will flicker down to my mouth, and that he will look from one of my eyes to the other.

What does this sort of eye contact mean?
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