What would u do?

ok so i have this boyfriend and he told me he wanted to be togather foreve we have been dateing for a year and 3 days but he now thinks i am lieing to him because some rumors started that i selpt with his friend and he does not belive me and now he wont answer any of my calls he talk to all of my friends but ignors me i told him i wanted to work things about but alls he does it walk away what should i do