Would this be inappropriate ?

So I’m studying for a big standardized test to get into a grad school. A guy friend who took a prep course with me 2 years ago is also studying to retake it. We went on one lunch date and met up for coffee 2-3 times about 1.5 years ago. We flirted on/off but never dated. We worked together for a short while.

I’m currently in a relationship with the most amazing man ever. I have 0 attraction to the other guy. Literally none. Just friends and former colleagues. (I don’t think he’s attracted to me anymore but I’m not 100% sure). He asked if I would want to get together sometime later this year to study. Is this inappropriate? Like I said, I have no feelings for him and could never imagine cheating on my SO (for me cheating is a hard line). I just don’t want to do anything that could accidentally be perceived as “wrong” given the fact that we went out one time nearly 2 years ago.

(Side note: I think Im mostly paranoid because I might’ve just been reading this app too much and people saying that you’re not allowed to have any opposite gendered friends).

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