Have you known someone you cared about and had a great relationship with, but was a bad influence on you?

yes, i had this friend back in kindergarten through 8th grade that was my best friendd, i cared so much about her,i was always there for me and i thought she cared for me too and was there for me too.. but when i told her about things that had happened to me that mad me sad,angry,upset or depressed all shed say was"wow" like shedoesn't't even care... then after id tell her shed go on about her anthat'st's all she cared about. But shed alwaconvincece me to sneak out of the house, smoke weed with her, have sex and stuff like that, and i knew all of that wasnt right, and every time i told her no, it's not right she always said"its ok,nothing is gonna happen,your parent's will never find out. so come on!" She always told me if someone pissed me off i should instantly through a punch at their face... but one day i got really angry at this bully who always picked on my brother that was in 7th grade i grabbed him by his shirt,pushed him on the wall and punched him. And after that i was so scared, i had no clue what i did, i knew i would have never done something like that if she never told be too.. and because of that i had detention with the most strictest teacher you could ever imagine for 1 month, before school started,during lunch, and after school. I was grounded for a very long time, i couldnt do anything.. couldnt hang out with friends,no use of technology at all.. so no phone,no xbox,no playstation no nothing like that,no tv, i was bored out of my mind cuz teenagers dont play with toys and stuff.. so i spent my days after school sleeping since i had nothing to do.. i fell behind in school cuz i was so upset with myself i was so depressed, i turned into a mess...she was one sick of a bastard i have to say but there is MUCH more to say about her but ive said enough so this was my friend of my past.