NEED ADVICE ON HIS PSYCHO EX GF

so kind of a long story, but basically this guy i'm talking to has a crazy ex gf who he dated on and off for about two years. from what i heard, she messed up in the relationship but they've been broken up for at least 6 months and she's still not over him i guess. so when i started talking to him, she started harassing me on social media, calling me a whore and even threatening me in person. last night i was at a bonfire she was also at and someone came up to me and told me to watch out because *britney said she was going to come punch me in the face. yeah, told ya shes crazy. and now she's getting all her friends in this town they're from to gang up and hate on me, i know they talk bad about me but it's just not something i can really ignore. what do i do?
*name changed for privacy purposes