AITAH for inviting my besties “ situation “ to my party

Imma start by saying yes the punctuation is trash but this is reddit not the newspaper so get over it

So i 24F and my best friend 24F have been besties since college but we grew up in the same city and have multiple mutual friends. One of the mutual friends we have I have known them since 6th grade and they met later on in high school.

So lets say my friend will be mary and our other friend will be kate ( not real names!)

So me and mary are bisexual but kate is lesbian/a stud. Mary and kate has gad a crush on eachother but never acted on it until about 3 years ago. Which was the worse time to act on that because they both were in relationships. Kate had a girlfriend and mary had a boyfriend . Like omg i told mary dont cheat but they did what they did and then her boyfriend found out and it ended and they worked on their relationship. Now they had some problems but they still love each other so they stayed.

Butttt mary tried to get me to stop being friends with kate out of respect for her relationship and i was like umm no lmao , like i told her ass not to cheat you not finna control my life. So we moved on but she still wanted to mess with kate again. Over the years she would ask me to FaceTime her while we were out on our friend dates or see if she could pull up whenever her boyfriend wasn’t around and kate didn’t like that bc she felt like she got bad karma from the first time they were caught cheating.

So time goes by and i plan on throwing myself a birthday party, so i didn’t invite kate originally because of mary’s boyfriend coming to the party with her but then she told me they wouldn’t be able to come to my party because of their anniversary and i was a little sad because its my bestie of course i wanted her there but i understood the situation so it was cool. Since they weren’t coming i decided to invite kate. so all invites have been sent and a few days later mary calls me and tells me they decided to come to my party and i immediately tell her that i did invite kate and then she says “ oh we’re not gonna come then “ and basically that was the beginning of the end of our friendship because after she told me happy birthday she never said anything else to me again. And i don’t feel like i did anything to her. So whats tea?