My best friend has been irritating me for a while and I don’t know how to communicate this with her respectfully.

Before I stay off: I’ve known my best friend for a few years now and she’s been irritating me for quite sometime and I’m not sure how to communicate this with her.

Also I love my bestfriend I can’t imagine life without her but the way she acts sometimes is just…
:/

Ever since early February last year when she ended things with her bf of one year she has just become so boy obsessed in the sense that she’s talking to a new guy every few weeks (sometimes more or less) and getting into relationships but then she comes complaining to me about how she’s unhappy with it so I provide her solutions but she never listens and it’s almost as if she likes having these problems bc it makes her life interesting or whatever.

She’s had a few boyfriends since then and then two months ago she broke up with another bf and almost a week or two later found some other guy. She found herself not interested in this guy so she asked me what to do and again she didn’t listen until I had to force her to tell him how she feels bc it’s not right to lead him on. Plus, after she broke up with this guy we had a talk and I told her it’s better to take some time to focus on herself before getting into another relationship bc the previous one affected her mentally and she was in a bad place and she agreed and said she will do this but obviously she doesn’t listen.

So fast forward to last week, there was this new guy and she had a crush on him but another girl in our friend group also liked him and my bestfriend knows she’s pretty so when she heard that, she told me she’s gonna get with this new guy just to spite the other girl bc she doesn’t really like this girl in my group. Also she heard from someone this guy likes white girls (my best friend is white btw) so she was ecstatic that the other girl doesn’t stand a chance bc the other girl is brown and she was saying how the other girl isn’t even his type anyways but the way she was saying it was so racist. So fast forward again another couple of days and now she and this guy are talking and she says she really likes this guy but she gets attached easily so idk. People are also talking abt her bc she’s well known and one girl was even telling me how my best friend is “boy crazy” so it’s gotten to a point where people that are outsiders are commenting on it since it’s become quite obvious.

Another thing, my bestfriend has a very bubbly and happy personality but when she’s with this other girl in my group (not the one mentioned earlier) and it’s like she becomes so much worse and louder and immature to the point where it’s not funny but just straight up annoying because I can’t talk to her about anything without her not taking me seriously and when we hang out as a group (like me, her and 4 other people) it becomes so exhausting to deal with her. She does this voice which she thinks is funny and she over does it to the point where it sounds like nails on a chalk board. And when I wanted to watch this movie with her she ended up ditching me at the last minute to go hang out with this other girl. This other girl in my group I’m talking about isn’t a good person at all , she’s got some very conservative opinions and is really rude and judgy towards anyone that has coloured hair, face piercings or dresses alt AND she’s racist.

(I do not like this girl at all.)

The thing is that she ONLY does it when she’s with this other friend but when it’s me and her it’s different and she’s not immature or anything, I don’t think she’s trying to impress the other girl she just happens to be overly loud and stuff without being aware. The longer she’s around this girl, the more ruder she gets, she will start judging other girls around by pointing out things like how hairy their legs are or how their dressed, and then it gets even worse because she will start saying racist things casually and this other girl and her have gotten pretty close and are sorta turning into the same person almost because of how they act.

For the record, I’m not jealous my best freiend is getting close with this girl, she can be friends with whoever she wants, I just don’t like Thi specific girl she’s gotten close with because of who she is as a person.

So what I’m asking is how do I talk to my friend respectfully about the way she acts because she doesn’t realise what she’s doing or how she’s acting, and she’s always one to call other girls male centred or obsessed with relationships when she is like that herself but is in denial if I bring it up.