This stuff is hard,
@Justmehere, and you're tackling it head-on. Well done for that.
I'm not going to be dragged into being invisible again in relationships again. I have a limit, I have a boundary, and why does that have to be so hard for anyone to accept that maybe I want to be in the relationship but not be invisible?
(bolding added for emphasis)
Here's the thing: you have made a decision, and it's a really healthy one. You want to construct your relationships differently. This is awesome.
You cannot be at all concerned with whether or not people accept your decision. They will either be able to understand and talk about it and work it through with you, or they won't. That part is all them, and not at all you. You can't fight for it - and if you do fight for it, you will shoot yourself in the foot, because then you are engaged in the un-winnable war called 'get other people to change'.
She will get it, or she won't. She'll try and change, or she won't. It will be really, really painful if she doesn't get it, and doesn't change - but that pain is the sadness of change, a friendship that has reached its ending point. You have to be fairly strict with yourself (in my opinion) to make sure the sadness isn't about how you didn't convince her, how you waited too long, whatever.
So, when you do talk with her - try and find the headspace of having already accepted your own choices, and being open to the possibility of her accepting you where you are at. The better you do this, the more relaxed you will be, and you'll have that tiny, necessary bit of detachment that allows you to see that you are a whole entity, with or without that particular relationship.
Ugh, I don't know if this is making sense. But it's something I've experienced, and done, and am trying to share what I realized about the real meaning and importance of that phrase we say a lot, which is that you cannot make other people do anything. You can only control your own actions. If you set yourself up as 'the person maintaining the boundaries', even, you're subordinating yourself to the relationship. It's a two way street, and she's got to come to the table. If she doesn't, you unfortunately need to find a way to detach that you are going to be comfortable with - and that's going to involve accepting that you are not responsible for keeping her alive. That, in itself, is going to be a very complicated thing for you - because you've lost people to suicide, and so a big part of you is engaged in trying to re-write the ending of some other, deeply painful experiences.
Can you keep in close contact with your therapist through all this? Maybe time your communication with friend so that you have therapy support either right before, or right after?
Sorry, I'm babbling at you.