Questions: Guy's Behavior

I was at a friend's party. I have met his brother before but this is the first time we really chatted, about nothing in particular. he's quite attractive, reticent and chill, albeit mischievous. I didn't chat too much at the party, kept it low key.

As the night died down, a few of us were left, drinking and chatting. We both got along well, both of us were chill and quiet while others chatted. We talked a few times across the room, friendly and smiley, nothing crazy. Once everyone left, we all cleaned up and had some laughs about the night. Both he and I both slept over my friend's apartment.

The next morning, a few of us were watching TV and chatting, getting along. At some point when everyone was quiet, watching the show, my friends brother and I locked eyes across the room for a very long time, around 4-5 seconds of super intense eye contact. He looked into my eyes very calmly and confidently and I did the same back. Neither of us smiled but there was a noticeable intensity and potency to it, but nothing creepy or scary but rather... intense.

I can't tell what happened between us. It's really sticking in my head. The intensity of his look, I liked it a lot. He felt very confident and self assured.

I left and there was an awkward side hug and thats all.