About her studies, i tell her about mine, she asks me to show her how to shave her legs and i show her, normal stuff sisters do. we got changed into our pjs and i was gonna tuck my little sister in when my boyfriend was passing the hallway, he stopped to ask me why we were together in the bathroom and i just told him that we had a shower, he completly stopped in his tracks and asked ”you showered with your sister?” so i told him again ”yeah, i showered with her”, he almost yelled at me, saying how im so disgusting and how i dare to show my mature body to a child like her and if i was a lesbian (?), i told him i don’t think theres anything wrong with showering with my younger sister and he just started shouting how i am a s__t for that, i snapped and said that if he is gonna continue acting like that im gonna dump him and he answered me by saying that i am the a__hole for ‘acting’ like that in the first place. what am i supposed to do?