Do guys get jealous if another guy talks to the girl they have been talking to even if the girl is NOT his girlfriend?

BeautyBeast90
I have been talking to my gym crush and we were at the gym and I could see him from across the room. Well another guy came and talked to me and I saw my crush leave the area.. he disappeared for about 15 minutes. Did he get jealous or why did he just vanish?
Do guys get jealous if another guy talks to the girl they have been talking to even if the girl is NOT his girlfriend?
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