Should I cut ties with my best friend over this?
Hey everyone, this is my first time posting on Reddit, and English isn't my first language, so please keep that in mind when reading this.
(This has been toying with my mind for the past couple MONTHS and I need some outside advice)
Before I start, I think I should give u some background information. Me (20F) and my best friend (20F), let's call her "Fiona", have been friends for about 4 years. This honestly is the best friendship I have ever had. Through bad and through worst, she has always been there for me and supported me unconditionally, even through some of my hardest moments. We have managed to -so far- be completely honest with each other and always let each other know when something is bothering us. We always figure our shit out and move past anything life throws at us, but I'm not so sure I can move past this.
Fiona and I are in the same friend group that consists of 5 guys and 7 girls. Two of our friends, "Peter" (20M) and "Clair" (19F), have been in a relationship for the past year. Ever since our friend group was originally brought together, Peter and Fiona seemed to get along really well, as they were pretty similar to one another in many ways (both have short tempers, have a similar sense of humour, are sensible, etc.). Now, and I would like to highlight this, when they first started growing closer to each other, I had a conversation with Fiona about their friendship, where she let me know that they had already had a "talk" and made it clear that nothing was going on between them. As the months passed, as I would later find out from my best friend, they would have even more "talks" wanting to set some "rules" and emphasize that they were just really good friends.
They would pretty much act like siblings, constantly fighting over little things, but always mending their friendship minutes later, sharing all their secrets, picking on each other, you name it, they did it.
Fiona was actually REALLY close to Clair as well, which often led the 3 of them (Fiona, Clair, and Peter) to go out together. Overall, they were inseparable.
Fast forward to January, Fiona, Peter, and a few other of our friends have just come back from taking part in an MUN conference, and Fiona calls me and asks if I would like to hang out, to which I said yes and that I would be at her place in an hour.
Once I arrive, she greets me with hugs, and we just get talking for hours. Just as I'm about to leave, she suddenly pauses and asks if I could stay a little longer, as she had something she wanted to tell me. She seemed pretty bothered by whatever it was she wanted to tell me, so I told her I would stay and hear her out.
That's when she suddenly started to cry and tell me everything.
Turns out, SOCKER, that something WAS really going on between the two of them (Fiona and Peter) and that it had gotten to a point where neither of them could control it anymore. Long story short, after struggling to "keep to themselves" this entire trip, on the last day, when everyone was somewhere else, they met up, talked, and then just started to make out.
I was truly sick to my stomach. What the fuck was wrong with both of them???
And it wasn't just the "making out", nooooooooooooooo it was A LOT more.
Pretty much from the BEGINNING of their friendship, both started having feelings for one another (hence the "talk") but decided they could maintain from doing anything inappropriate and just continued talking. However, the feeling obviously didn't go away. They grew even closer, to the point where they knew everything about the other person, constantly had their hands on each other (not in an inappropriate way, rather constant pocking, tickling, head patting, hand stroking???? They would even fight whenever we hung out at one of our friends' houses, grabbing each other, falling to the floor, u get it). They would also talk about this sudden change, and their feelings, confessing their LOVE to each other??!!??!! Still, though NOTHING happened. Peter stayed in the relationship with Clair, and Fiona pretty much became the "third member", always joining them, as Clair had never thought anything sinister was going on between them.
As she was telling me all that, I just stared at her and didn't know what to say. We fought A LOT about it. Thankfully, I guess, both she and Peter knew this was messed up, but that barely changed a thing. He and Clair would OBVIOUSLY break up, and that was that. But ACTUALLY it wasn't, because not even a week later, Clair would decide she wanted to get back together and Peter immediately said yes, and then before u know it everything was back to normal.
Fiona and I were in a weird spot. I mean, surely I wasn't directly affected by what happened, as I wasn't involved, but all that made me see her in a new light. Thought that things would at least get better now that everyone was pretending nothing had happened, but ooh boy was I wrong.
U see, after Peter and Clair got back together, he and Fiona grew apart, as they should. But literally not even a few days later, they were at it again, getting a little bit too comfortable with each other. I won't get into more details as this post has gone on for way too long, but although they never did anything else, such as kissing, etc., they continued with the touching and the secrecy until last week, when Peter met up with Clair and broke up with her.
Fiona has approached me to talk about the situation and has let me know that although nth has happened between them, she can't guarantee nth will happen. She even went as far as to say "Hopefully we won't do anything too soon, but I don't know. Sth will happen though eventually for sure, the feelings are too strong". WTF?
So, Reddit, what on earth should I do?? She knows how I feel, and knows how fucked up her behavior is, but does kinda try to hold back and not let things get too carried away.
I know she's horrible for all this, but I don't wanna lose my sister, what do I do?