Son compartido

AITAH for not forgiving my sister for sleeping with my boyfriends in the past? My sister and I had a good relationship until she was a junior in high school and I was a senior in high school. It was then she first slept with my boyfriend. I broke off that relationship and yelled at her a ton and our relationship changed that day. But I got to a point of speaking to her again and being good but not as good as before. Then she did the same thing twice more. Once in college and once right after. Af