advice for keeping my head up while living with emotionally abusive housemate?

any advice will help!! i am on a lease where no subleasing is allowed but one of my housemates treated me very badly. he used to be one of my best friends and now he completely ignores & stonewalls me and won’t even look at me when i try talking to him. i try to avoid him as much as possible but it’s hard bc we live together. Also he’s a narcissist (didn’t know before moving in) and is being fun and nice with everyone else so i’m being isolated by him and then made out to look crazy when i talk about being hurt. please any advice will help !!