Bitch..

So basically i need some help getting over an issue.
About a year ago i found out that my boyfriend slept with his best friends girlfriend (about 2yrs beforehand) and he filmed it. She didnt know. Its sounds bad and he never really gave me any details because we actually went on a break for 5 or so months.. (We were doing very long distance i.e different countries and ends of the globe. At the supposed time this happened i was casually envolved with someone else too. Anyway this year i found out she had slept with this other guy i know and realised she's basically a whore. Its been ages and still think about the whole scenario and feel shit about myself. I dont know how to get over it. I feel like im not good enough sometimes and i just fucking hateeee her but i always see her. Helpploo