Idk, if she was a 'good' friend who's genuinely worried about Agawa's romantic life, she should be telling her off about what would be best for her, or at least try to explain why most people would rather keep one boy/girlfriend instead of literally fucking around. If she isn't as 'experienced' as her and doesn't have a boyfriend then that begs the question even more of why she's trying to stick up for her if they have so little in common. I know, 'common interests aren't the only things that keeps friends together', but if she's going to be that much of a bitch to a guy now when she knows how many guys Agawa has slept with, then she's basically trying to take the moral high ground that she shouldn't even be standing on, knowing how weak and pathetic the MC is compared to other guys. She's just taking advantage of that to make herself look/feel better.