Friendship – she gets mad and needs too much attention

I have a best friend since high school, we are 27 now and I’ve matured a lot more than her. She still has the mentality of a teenager, she causes a lot of unnecessary drama between her friends and by getting mad at me when I don’t hang out with her enough.

I’ve spoken to her before that I can’t reply every single day and I try to see her once a week, if I don’t she’ll be upset with me. I used to hang out with her and my other friend but we stopped doing that this year because my other friend doesn’t want to be her friends since she’s all drama so I stopped inviting them together (occasionally we all will) and I let my bf and my other friend hang out which she gets mad or jealous she wasn’t invited so I’ve stopped telling her when we’re hanging out.

I’m really walking on egg shells. We recently went on a trip (my partner and her) for a concert, I hung out with her the entire morning to make sure we had alone time because I knew we had to meet my partners friends in the after noon. We met them for lunch for only an hour and she was being rude, playing videos outloud on her phone and sighing loudly. Obviously that isn’t a good impression so his friends don’t like her.and now my partner doesn’t either. I confronted her after saying I thought it was rude but she said she did nothing wrong and if anything I was the rude one for not talking to her during lunch (I was socialising with his friends and his friends were trying to include her) she’s very codependent on me. I can’t leave her alone, she always needs me around to do something. It really added stress to the trip because I wanted to freely go around and do my own thing.

If you’re wondering why I’m still friends with her, apart from that she really is a good friend in terms of being there for me whenever I need, she’s been with me through my toughest times and she’s the only one I really trust. we have so much history and if it wasn’t for all the drama she’s really a good friend. It’s hard to throw away a friendship built over years but honestly if I met her now, I wouldn’t be her friend cause she isn’t someone I’d befriend at this age. I really don’t want to stop this friendship, but even if I explain to her how I feel she doesn’t quite understand or says you hang out with your partner more than me so why can you see and talk to him but not me – it’s different with a partner though because you are building a life together.

Sorry for the ramble I needed it off my chest, I’m quite lost on what to do. I told my partner if she’s still acting like this and causing drama by the time I’m 30 then I honestly don’t think I’ll be able to bare it anymore and would seriously consider having to remove her as a friend.