His brother was starring at us?

What could be?

I was with my boyfriend and his family in a store looking stuff and we all got separated. In a moment I was looking some stuff and saw his brother which is 22 (I am 26 and my boyfriend 25). He was looking at me from far away I noticed but didn’t make it noticeable for him after that my boyfriend came and scared me from behind so we hugged and while that his brother was still there looking us together, my boyfriend didn’t noticed him either so I decided to move and take my boyfriend to another spot because his brother would keep starring. What that could be?
His brother was starring at us?
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