Guys, how do you feel when your crush talks to another guy?

well, I was talking to his friend and I feel like he likes me. And I felt like he got sad that I was talking to his friend but, not him.
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we where doing group work after I talked to his friend he got quiet and looked at everyone in the group except me he'd just take quick glances.
Guys, how do you feel when your crush talks to another guy?
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