Im seriously considering ending the friendship between me and my best friend

Im considering of just letting it fade out instead of just coming out and saying it because shes in the owner so I have to make sure I dont risk my job. I dont want to hurt her or cause any drama or fights , I just dont feel like we are close anymore and When She taken the girls side who lied about me and tried to force us to be friends after that and the girl never appologised , I dont appericate it , since shes close to that girl , I decided im better off leaving them two to it. She also keeps finding exscues not to hang out with me either which is an huge deal to me. I will start by staying on my own at work , not sit with her or join her or get changed next to her and stop messaging her , then I will unfollow her on instagram. I dont want to end it all at once because I like her a lot and im heartbroken its gotten to this point , I just feel like we arent good for each other and we keep upsetting each other , our friendship has grown toxic over the past one month , I just want to save myself and her from anymore pain.