2 years later and people still wont believe me

ive been trying so hard to not let what happened take over my life considering im in a new healthy relationship with the most perfect guy but i cant seem to go over a few weeks without something happening and its just taking it out of me its draining. my ex SAd me for a year when i was 16 no one knew until a year after we had broken up and most of the people who matter believe me but some didnt and it hurt. yesterday i was at my older brothers house when my friend had rang me and told me that he was talking to one of other friends and she was shit talking me saying i was SAd for attention and how she thinks i just love playing the victim when in reality i try so hard to make people not look at me like a victim. i didnt expect her of all people to say what she said my friend said he defended me and she went off on a whole rant saying how i have everyone wrapped around my finger and how its bullshit honestly the thing that really pisses me off is how she texted me then after asking if were going out for my birthday ive left her on delivered because i cant deal with her. she said some other things to him that cut deep and i was on the phone crying sat on the floor of the kitchen hoping my nephew wouldnt walk in but thankfully my brother did because i disappeared for like 30 minutes i honestly just cried on him for a solid 10 minutes over this girl. what could i have possibly done for her to not believe me ive even gotten close to telling her everything she knows some things that most people dont and joked about it behind my back which was one of the main reasons this hurts so bad thankfully i never told her everything because god knows what she would say. but why do people continuously choose to believe the abuser i cant take it.