So, I've been seeing a close friend's sister... She's 23, I laid out the boundaries and it's a NSA relationship at this point. Some days I'm fine with it, other days I'm not... I'm feeling this arrangements adds too much stress to my already complicated life, (full-time student, 2 bands, teaching, odd-end jobs, physical activity). I'm more heavily invested considering that it is my friends younger sister... Trying to stay unattached. Help?