My best friend kissed my crush?

Anonymous
Alright si at the beginning of the year I moved to a new school which was my best friend’s school. When I came into my class I instantly fell in love for a boy let call him Matthew. So me and Matthew aren’t very close but we’re talking a little bit and there were a lot a rumors saying that he liked me and his best friend texted me to say that Matthew had a crush a me which was very unexpected because we aren’t very close but I thought that maybe he was shy. So I wanted to know him more and I decided that I was going to text him on the weekend. But on the weekend I saw on my best friend’s ( let call her Addy ) Snapchat story that she was at a bar with some friends and there was Matthew and she didn’t told me that she was about to go there with them. During the night I was feeling kinda bad cause I didn’t know what happened there, she texted me saying that she was really sorry but she realized that she still had feelings for Matthew ( cause she used to like him 4 years ago but nothing happened cause he didn’t liked her and I didn’t even knew her but she told me she was ok with me and him and that she was over him ) so she said that she still have feelings for him and that during a truth or dare she had to kiss him. I cried a lot during that night cause I never thought she would kiss him. She said that she hoped nothing was gonna change between her and me if anything happen between Matthew and her which proves that she’s gonna try to date him even tho she know I’m in love with him. I don't know if I should tell her to do it even tho it makes me cry or if I should let her go do whatever she wants and never talk to her anymore because it hurts or anything’s else. Please tell me guys what would you do?
My best friend kissed my crush?
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