
Shoot.. I think I know which one you meant. I’ll keep looking for it. Was there a scene where the popular boy was talking to the friend about the shy boy’s and friends ‘relationship’, but then the friend says something along the lines of “wait wait wait.. I’m not dating anyone”? The friend has glasses, black hair and a bowlcut (not sure about this one) I think..

I found it by the help of a user called badgalriri, it’s the first oneshot of Yajirushi by Harada. I’m 100% sure it’s this.
http://www.mangago.zone/read-manga/yajirushi/bt/306579/Ch0/
idk the setting, but it was something like this one boy who was really popular got confessed to by this shy boy, so he played around with him and made him carry his stuff, go buy drinks and other things for him, and the shy boy got tired of being used so he pretended he had a boyfriend and showed the dude a pic of his friend, and the popular dude was jealous until he found out the truth and got mad and confronted the shy guy.
distinctly remember a scene where when popular dude confronted the shy guy, the shy guy was headed into his apartment, he looked up in confusion, and was slammed into the wall by the popular dude. and afterwards the popular dude is more nicer to the shy dude?