Please help

Jessica

I need some advice, my boyfriend has a friend that has a little sister, and they're both 15, and honestly.My boyfriend got high with his friend but his friends little sister was still there, and his friend fell asleep.he had felt kinda dizzy, and he tolled me this on the phone, his friends little sister grabbed him by the arm, and kissed him on the cheek and then the lips.Short story, he then tolled me he pushed and I dont know what to do, I feel relieved because I'm only 14 and our 2nd year anniversary is in 4 days. but should I break up with him? Ir just tell him it's okay and get mad at the girl?😭