HIGH SCHOOL DRAMA

SOOOO I have this friend. And i would consider to be my best friend. And then there's this boy. Both of us were friends with him but Me and him were definitely better friends. Then I started to like him and so I told her. Like would this make you uncomfortable since we are all friends and she was all like "omg no y'all are perfect for each other" blah blah. soooo me and him were pretty flirty for around a month but then she started to flirt with him too. So I confronted her and asked if she had feeling for him and that it wouldn't make me mad I just wanted to know she of course said "no! We are just friends!" At this point she had very much known I liked him a lot. So time went on and they started to text ALL THE TIME and hang out alone and then I found out when I had asked her if she liked him then she had already kissed him THREE SEPARATE TIMES!!! So I said "that's not nice and I don't want to be around you". Now they are dating. When I told her how uncool that was her response was "I love you and I hope one day you can just accept me and his relationship and we can all be friends again" SOOOOO I believe in this there are only three options I can see (thus this pole) but would love some suggestions on how to handle this

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