ff, why don't you believe you could offer R if you were in her shoes? What would you have, instead of the possibility of R? What did you have, when it happened to you? Too much sympathy, too much understanding, too little self respect or self protection? Did you try to "fix" it?
Would you be capable of forgiveness, but not R? They are not at all the same. Or, if it happened now do you think you would be totally incapable of anything but hurt, and pain, and rage?
Would there be any sort of empathy in there, in all the betrayal, as the emotions swirled around? Any sort of "ohh, you messed up bad, didn't you, and the consequences are going to suck because now I hate you, and you could have had my love..." Any pity, for the poor, damaged choices made by this person you used to love?
Or would the wayward spouse simply stop being a real person to you, and simply become the source of your pain?
In your former relationship, during all the gaslighting and betrayal, did she become "only" a source of pain? Or did you empathize with her too much, see too much of her damage, stay too long and believe you could fix it? Are you a person who understands emotions, or are things mostly logical, facts in your brain?
Now, imagine your current relationship with you as the betrayed. Can you imagine being in a place of intense pain and loss and trauma...and still seeing the other person as a human being who messed up? Can you imagine feeling intense disappointment in them, because you know they are capable of better, but they chose worse?
The ability to feel all of those things more or less at the same time is what empathy is. It is not forgiveness. It is certainly not R.
Empathy is the ability to recognize, while swept up in your own emotions, that the other person is a human being, with feelings also. And nothing else. That's..pretty much it. You remain detached, not getting pulled into their emotions, simply recognizing that they exist.
It is not sympathy for those emotions, or obligation to soothe them, or feel that you need to stick around to fix them, it is not condescension. It is simply an acknowledgement that even a person who has done something truly awful and evil and colossally stupid...is a person. It means not forgetting that "person" when you are tempted to only see "cause of pain".
A Wayward spouse is, for some time at least, simply a source of pain. Almost an "object"of pain.
Empathy, and the ability to get to R happens when you look at your source of pain and also see them as a person, not just an attacker. Without taking on the burden of their emotions.
It is simply. "I see you. I see you are in pain. I am also in pain, so I am going to deal with that first. "
If, in past relationships, you swung too hard into the other person's emotions, taking on that responsibility, when it was actually theirs, you may never have built the necessary resilience to feel empathy properly.
Possibly when you are tugged by someone's neediness, you feel like you are dragged overboard with them, drowning, so you fight it with all your might. You may never have learned how to disentangle yourself from someone else's emotions. Every emotional encounter becomes a death match, a situation of absolutes. Ignoring other people's needs becomes a reflex, because acknowledging them is dangerous...you don't know how to save yourself if you need to, and you lack the ability to judge when something is normal or if it's time to get yourself out.
Empathy is, " I see you drowning. I am throwing you a liferaft. I am not getting in the the water with you."
Emotions are sticky, and they may try to drag you down.
Resilience is, "You are trying to trip me now that you caught the liferaft. I am letting go of the rope. I see you, but I am letting go of the rope".
This is not an obvious concept at all, but it is a learnable concept. The book "The Art of Non-violent Communication" offers concrete steps for exactly how to create and maintain the separaton between your emotions and other people's emotions.
Until you have that small, stable emotional distance, empathy can feel impossible, dangerous, or abstract.
And without empathy, I'm not sure anyone can really get to R.
For me anyway, this was all crucial, both in understanding my WS's total lack of empathy towards me, and my own, very clear understanding that I had the emotional strength to remain. I work with these concepts a lot so there was never my question that I would be able to attend to my own healing. But I had to recognize how totally enmeshed I had become with him and how much I had to distance myself and let him work through his own pain.
Keep in mind that if you had enmeshed relationships growing up, you may lack the ability to discern the difference between your own feelings and someone elses. What you are imagining in your head when you think "empathy", is probably not correct. It's a very subtle difference from both sympathy and indifference.
When you really get inside the emotion of empathy, the concept of R coming from a BS will start to make much more sense.