M30, F22, been in know of TRP for 4+ years and N-count of 42, but still lost with this social situation.

I was spinning 4 plates over last fall and caught feels for one of them at the exact time she soft nexted me for being too much of a player. We share 100% of our social circle that meets several times a week and none of them know we were fucking for 4+ months. On the surface level, she still seems like my friend although she won't have anything to do with me unless I push the interaction.

Problem is, this is large friends circle and also my only one in this country. It's painful as fuck to see her 3 times a week, especially as she very openly flirts with my friend who knows nothing of what has happened. As additional complication, I had to leave country for a month just after getting soft nexted, during which she rebounded and officially dated another one of my friends from the circle, 16 years her senior, for a very short while. Their interactions, and the shortlived age-gapped relationship is now constant focus of attention whenever we gather and she is thought to be some poor girl that needs to be protected from clingy ex - even though she is currently hitting heavily on my friend number 2 from the same group.

Now, time heals all wounds and I know that I'm not getting her back, but I need some strategy to approach this friends circle. I'm going insane watching "my girl" nearly make out with my none-the-wiser friend on near daily basis. I've been sleeping only 2h a night and lost 5lbs a week since coming back home from my month long exile, and this is currently very unhealthy.

I'm considering

a) The spartan option of staying strong and keeping participating in the gatherings without saying anything - just trying to forget her and ignore everything that happens. We will both keep our friends, 1 in trillion chance she comes around, and I get to continue going insane watching the one thing I couldn't have all day every week;

b) Taking distance of the whole circle without telling anyone the reason, or at least the events that she is in (90+%). Leaves me basically as a hermit, but at least given enough time I'll get over her. People will think I'm weird for suddenly quitting for no reason, but I will likely still keep my friends even though I can't participate common parties/gatherings anymore.

c) Dropping the nuke that we were fucking for 4 months before she dated my 1st friend, and that seeing her flirting with my 2nd friend is making me sick in my stomach and that I can't be in same space with her. High likelihood that all hell will break loose and and the group will be split between us. I will look like a dick for (initially) using her for sex while fucking other girls, she will look like a bitch for fucking 3 guys in row from same 15 person group. Some will hopefully understand me and meet me in smaller gatherings without her. I don't intend to be a dick about what she's done, but instead just express it as neutrally as possible as an explanation of why I wish to hang out without her. With me being the 2nd person from the group in this situation however, it will still turn nuclear as she is quite popular - and at 30, it's not easy to create new friends.

d) Just letting the friend that she is currently flirting with know about my past with her and hope that he refrains from being a cunt in front of me. I'm kinda 50/50 if he will prioritize getting his dick wet or keeping our relationship good. If he will play ball and just dick her out of my sight, there's no one else in the group that would do the same shit to me anymore and I can potentially keep my sanity.

This is a prime lesson in "don't shit where you eat", or perhaps in this case - don't carry your shit (plates) to your diner (friends circle). Any advice on how to keep my sanity is welcomed.