My crush looks at my best friend a lot, does it mean anything?

Fwcheerios
So my crush has made it known to all of our friends that he’s really into me. He shows public affection towards me, always wants to be holding my hand or be around me. It’s very obvious that we both like each other. But sometimes I catch him looking at my best friend, and not just little glances, but staring. They make silly faces at each other, he goes out of his way to look for her and go talk to her, he helps her with her workouts when we all go to the gym. I don’t know, It gives me an achy feeling in my gut. Maybe I’m overthinking it… because after he’s done ‘flirting’ with my bff, he comes to me and makes me think that’s he’s into me again which confuses me. I don't know I just need a guys perspective and a woman’s opinion.
My crush looks at my best friend a lot, does it mean anything?
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