True friends?¿

So my best friend and I have been besties since 7th grade.. and me and her look very different she’s very pretty and I’m not the prettiest but yet any guy I’ve “talked” to or fw she had to flirt with🤦🏻‍♂️ and so I was chatting with this senior because we do the school play together and when him and I got into a fight she started being all buddy buddy with him and he asked her if they wanted to be like fuck buddies and she said yes. Now she has a bf and me and the guy are like sorta good again but she is still allll over him. And I’m honestly sick of it because I bend over backwards for her but when it comes to my feelings all she says is aww or changes the subject... I love being her friend but at the same time we’re breaking what should I do?