AITAH for cutting my bestfriends off for dating eachother?

To start, I’d like to say that these two were one of the closest people to me. The girl, who I’m going to call Mary, and the boy Jack, started dating behind my back.

I met Mary few months ago, during my freshman year at highschool. We instantly clicked and withdrew from the rest of our classmates, and grew closer to the point that i integrated her into my friendgroup. My friends and I are really tight and have either met in kindergarten or met few years back, so I really trusted her in order to involve her in plans and hang outs. Jack was always like a brother to me, I helped him a lot with his toxic relationship (he was the abuser.) and drug addiction. I know him well enough to be certain that he’s not in any way shape or form to treat a girl right because he’s a cheater and very explosive; so i told him before he met Mary, that I don’t want him to flirt with her.

Jack hooks up with any girl he can, and i’ve had several fights with him on this, but at some point we all just dealt with it since he was a good friend to everyone. As for my reasoning, Mary was also the only friend i had at school, since my other bestfriend lives across the world and only comes home for vacations. So when we all started hanging out during winter break, they instantly started to get along too well. There were subtle signs of flirty moments which i tried to ignore and brush off, but my bestfriend (Ana) pointed them out, so instantly; everything just erupted. She was way too close to him, always touching him, always smiling and making jokes with him, always using our inside jokes she wasn’t even there to see.

I talked to him about everything, he of course denied, saying it wasn’t his fault. I clearly showed discomfort and tried setting boundaries once again, but the next day, the flirting continued. We were celebrating my bestfriends birthday when Mary got drunk and Ana caught them cuddling in her bedroom, so I crashed out, screaming at them for lying and crying my eyes out; something I never do. Jack comforted me, got on his literal knees and swore to me that he will never have intentions with her. Immediately after, he pulled out a bag of crack, insisting he needs it and begged me to do it with him. I obviously didn’t, but i let him. I let him, and now that I look back, I regret not telling Ana. (she’s VERY against drugs in her house.)

A month passed, and there were few signs they were seeing eachother behind my back. Firstly, she asked him to hangout alone. I argued with Jack since he was the one to tell me, and he ended up reassuring me nothing was going on. Secondly, Jack suddenly cut contact with me, his reason being that I “told someone about something only I knew about him” and he refused to tell me what i said or who i said it to. Ana unfollowed him on everything, said that he’s shitty for not even telling me what happened and his overall reaction to the situation. I eventually talked to him and sorted things out, and a week passed till we planned to meet up.

I have everyone’s location on an app, so I was tracking down the groups driver (jack turned off his location) when i saw they were infront of her house. I called him, asking what he’s doing there, and he confessed to everything. They’ve been dating for a month, behind my back.

I texted her, telling her i’m cutting her off, since I was honestly shocked she’d break a bond like ours over a boy I told was no good. I cussed her out, but I tolerated Jack. I was very straight i would never trust them again. Eventually, before school, she texted me, apologizing. I told her I wish i could get over it, but i’m a very firm and strict person, and it really doesn’t take much for me to cut someone off for lying.

The next day at school, she tried acting normal. Making jokes, trying to get me to soften up or make me feel better. I’m ashamed to admit it but I told her that there is a chance i will forgive them, but we settled that we shouldn’t hang out for a while to let things calm down. I met up with my ex (Jack’s close friend, and before you say that i’m hypocritical, Jack and I werent friends while i was dating him.) and he told me he hung out with Jack and Mary, and she told him that I’ve been telling her i’m missing him and all that shit.

Obviously, i crashed out again when later into the day, she pulled up to my house with Jack and the others. I decided to completely ignore her because of what she told my ex since she had no business telling him all of that (she said it before we fought), but now i was really angry that she had the guts to come on my street. I told a friend to tell her that if i see her here again i’m gonna bash her head into the schools toilet, also called her a whore. Jack called me and we basically cussed eachother out for an hour, insisting i should come outside and face him. I refused, saying that if Mary is so bothered by my words, she should face me. (this girl admitted that she didn’t want come to class because she thought i would beat her. I never laid hands on anyone.) We stopped fighting, because it was clear we didn’t understand eachother.

All i really said is that my problem isnt them dating; it’s them lying to me for a month, while i treated them like family. I slept in the same bed with Jack, Mary stayed over at my house for days on end, and i constantly played therapist for them not once judging.

What also was confirmed is that the reason Jack cut me off was because Mary told him that I told her that Jack hooked up with his ex. (he says that he was just testing me to see if i’d tell her, which i did solely because i wanted her to back off, which is a lie. It’s confirmed by other friends. He did fuck his ex while he’s been dating Mary. Who would’ve guessed.)