IS IT OK TO HAVE A STUDy BUDDY OF OPPOSITE GENDER IF TAKEN?

hi y’all
so I have a study buddy who has a girlfriend but he is always trying to FaceTime me to study together and last time we had zoom he phoned me after for an hour when he could’ve just texted me “hey the teacher resolved my issue” and we get along really well, but in our friendship I’ve known him for four years off and in through school he was always just the text type with me and he’ll always bite his lip and I’m probably over thinking cus women are crazy and I think he’s sexy but we don’t flirt and he’s off limits cus he has a girlfriend but it made me think damn if I was a girl I’d be mad my boyfriend had a female study buddy he would phone for hours it’s almost three am and he just asked me to study tomorrow again he always initiates it and the funny thing is he’s retaking the course to get an A he already has the study materials. But I’m wondering if I’m right that I would be jealous in her shoes especially cus he’s said I’m attractive before or is he just genuinely trying to study? So two questions here is he attracted to me and would you guys personally be fine w your significant other having one on one sessions often with a hot person of the opposite sex?
IS IT OK TO HAVE A STUDy BUDDY OF OPPOSITE GENDER IF TAKEN?
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