I, (16F) am currently in a few HS classes with my best friend, she will be called Petra. Her boyfriend, who we will call Mark, is in ALL of my classes. Mark and I never really got along. We were never friends, never anything close. We would talk in few classes last year, very rarely. About a year ago, I became best friends with Petra. We are absolutely inseparable. Or so I had thought. Awhile after we became friends (possibly a week or two after), Mark had asked Petra out, to which she had said yes. They started dating. Not much had really happened between any of us, Petra and I had stayed close as we are now, everything was good. Up until I got with my now boyfriend. We can call him Jason. Jason and I have been together for a few months. Happiest, healthiest relationship as could be. Around halloween, me and Jason had planned to hangout on Halloween night, as I knew Petra was going with her family. I ended up passing by and walking with Petra, but only for 15 minutes until me and Jason broke off. A week later, Jason told me about how Mark was practically begging him to "fake an emergency" so that I wouldn’t hang out with Petra, but be with Jason on halloween. Of course, Jason said no, because the was wrong, and I was going to be with him anyway. No one had made plans with Petra, and I’m almost 100% certain Mark believed she was using her family as a lie to hang out with me. After about a month or two of dating, Jason brought it to my attention that Mark was asking about if me and my boyfriend had "yk". We aren’t like that, and barely make physical contact, or even eye contact, in the one class we have together. Regardless, it’s none of his business. I brought this to Petra, to which she didn’t exactly do anything, as far as I know. He asked again for a week, which I had overheard one of the times. Still, Petra hadn’t said anything to him. Now, he goes out of his way to walk Petra against the walls in the hallway so I cant stand next to her, he makes fun of me, and makes fun of my boyfriend. I cant tell if she notices or not, if she doesn’t want to say anything because of conflict, desires her relationship with this kid over mine and hers, or just doesnt care. I want her to be happy, but I cant imagine being with a guy who always looks at you in a sexual manner makes you happy. She, from what I know, isn’t like that. I can confirm because he always complains about how he can’t "crack" or even "get a look." He says all of this around me, and gets mad and upset when I confront him, or tell Petra about it. The same thing happens when I confront him about talking crap about me, my boyfriend, and my other friends. My boyfriend is a chill guy, equally as all of the other guys: a class clown, and doesnt do anything to Mark. I’m afraid Mark is guilting my best friend away from me, and that I’m losing her, and that he will eventually do the same thing with my boyfriend. AITA for confronting him and being upset?