Sometimes I think I should just give in to her so I can have some peace and quiet. I know this will likely make things worse in the long-run but I don't know how much more I can take.
this isnt the solution, because her wound isnt
actually about your friend. its about her feelings of betrayal, emotional abandonment, insecurity; her belief that you would put someone (anyone) else first, over her.
The things I have tried are having conversations with her, giving her lots of reassurance, making sure I spend quality time with her, building trust. But things keep getting worse regardless of how much of this I do.
youre not wrong using a positive reinforcement approach (and in general, it will help). but it isnt "working" because your attempts are mainly soothing her wound/fear in the moment. thats why your friends apology didnt accomplish anything. its also why her story has evolved.
it may help matters to speak to, and name the emotional wound, as opposed to dancing around your friend; to frame it as an issue between the two of you, not between her and your friend.
you might try something like:
"i think the reason this hurts so much is because it’s about how safe you feel with me. about whether id ever choose you second. about whether you matter most when something makes you feel small or disrespected. ive made mistakes in how ive responded to that, not because you don’t matter, but because i didnt realize what was underneath it all.
i want you to know i see that, and im not indifferent to your pain. but i also want us to talk about this as something between you and me, not between you and someone else. because this is about how we repair trust between us.
i want to make this work. but i cant lie about who i am, or cut off a friend.
to be clear, im not suggesting that you read any of this verbatim, or necessarily that you deliver it in one conversation. its the gist of SET, a reframing of the conflict, and some ideas for communicating it. it may be a conversation that you revisit multiple times, or pieces of a premise you communicate over time, and certainly, it needs to fit the context of your relationship, the way you speak, the way you speak to each other.
it also isnt guaranteed to "work". it is a way to stay grounded in your values while holding space for her underlying fear. to get out of the weeds and to the heart of the matter.
question: is this part of a larger pattern? has she, is she, able to tolerate you having a world of your own, without it becoming a test of loyalty?