Meh, the friend obviously didn't have a chance before she met MC. Why would she reconsider another guy when she's developing a crush on him?
Yeah, I don't see this being any type of problem IF the friend is interested in her.
Our FMC said a couple of chapters ago that she is in love with the MC...so for her to get wooed by someone else at this point seems very unlikely.
My money is on the new girl that was just introduced at the restaurant being the girl the friend liked that he has talked about before. We also just found out this chapter that FMC was asked to work there by the new girl since she was a regular and not by MC's friend. I do wonder if FMC and the friend have ever had any real contact before.