ladies help its driving me crazy

i have a bf and i really moved on from my ex. i recently went to a big bbq n my ex happend to be there( havent spoke to him or seen him). we had some words and started arguing, he stole my phone afterwards left the barbeque and idk where he stays or anything as ive cut ties with him. apparently people was calling my phone at the time that he had it n he was answering my phone!!!! my bf called and they had some words my ex LIED and said me n him are together and that we been having sex n its not true!!! So i did the find my iphone and had to meet the police at the location so they can get my phone. I get my phone back and its disabled he tried to get in it and i go to my call log he answered all my incoming calls and my bf text my phone(thinking my ex can see the text) arguing at him. my bfs brother just passed away he's already depressed. and my ex turns around and does this to me. my bf wouldnt answer none of my calls and eventually blcoked me. its not fair im really not messing with my ex!! he framed me and lied on me n my bf truly believes it idk what to do im hurt i really am i lost someone because of a lie. advice on what to do please