Replying to Dilema

well i know that ns isn't a great spot to get advice with girls but I'm gunna give it a shot.

so i kinda have this friends with benefits thing going with this girl, but she doesn't want me doing anything with other girls. theres this other girl who has an insane amount of things in common with me like music taste and skiing etc. and i know that the second girl is into me and i kind of want to hook up with her, but i don't want to mess up things with the friends with benefits girl.

Also. if i was to hook up/ possibly date the second girl, I'm not sure how much my closest friends would feel about it. she used to be a hard partier and my friends aren't fans of girls like that. so what should i do ns?