I hear your dilemna. I’ll hang on one point since even when the “unhealthy” one in my life did it, it stuck in my brain.
Me and my wife met under stressful circumstances, and we were both very accommodating to one another. It’s called codependency in most circles. We lived like that for years until she (the one I thought was unhealthy–don’t laugh) started drawing boundaries. I thought she was turning cold, and she was. She needed to heal herself. She did some, and chose to exit the marriage in time.
I’ve learned that no person can fix another. She couldn’t, and damn, she tried. And I was doing the exact same thing. I’ve had a focus since then on healing myself…ummm…since noone else was around maybe? My vision is changing slowly. I’m not seeing everyone else as broken. I just wasn’t owning my brokenness and was projecting my own onto others.
My advice would be to focus on YOU. Care for her as best she can, but let her make her own choices. Take the focus off her, and you’ll both get stronger. It will create tension. But be honest with her and yourself so she’ll see your real intentions. Love her. She’ll feel it and respond beautifully. Women are just built like that.