Ok soo i need help?

so saturday i was at the mall with my twin sister and my BF was sick...so i went in to zumies(a store) and saw his ex an me and his ex are kinda close kinda not u know? so i was walking around with her and a few other people so i was hanging out with this kid devon and hes gay so my BF brother called him and told him that i was hanging out with a bunch of guys which wasnt tru ... my bf called me calling me a and a lier so what should i do?