What ended your relationship with your best friend?

(I was the last person to know about their relationship that to at the end of 12th)

So first X became to close with me and even called me with nicknames and approached me saying he had a huge crush on me

Well me and my friend let's call her Sara (name changed) were the only girls in the whole class of 10 students so obviously we both are close with each other but because of my little cold character and straight forward talks we always had some small fights

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X spoke me too friendly and the same day I got to know that Sara and X are in relationship for almost 1 year and x trying to get me all this time

…… Never hate urself for some unwanted people and trust them with ur secret 💕

And she just replaced me with a new friend and I spent all my last school days crying and hating my own character 😞

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When I told my friend about this she just ignored me by saying I am soo jealous of her

Fast-forward to 8 months

But I politely rejected me and stayed as a friend

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My tenth percentage ended my 8 years friendship

Things became worse when my other classmate (let's call him x) came between us

Everything was nice until our 10 result and I got more than her so she started to distance herself from me and d got some new friends

My girlfriend lied and said she never gave oral until me. She was very skilled. I’m upset with her lying. Do I dump her?