Just in case you weren't aware; step 4 is making an inventory and step 5 usually involves sharing that list of harms and behaviours with a trusted person usually a sponsor. Its not normally until step 9 that you make amends to those affected - except when to do so would cause harm. There's a couple of steps in between, and from what you've said it may be that her current state is too fragile and you might cause more stress. As Beautiful1973 says it could create intimacy and trust, for her to know she isn't the only one going through it. It is nuanced, and you are the best judge of how it would be for her to hear your story. I wonder if there's a middle way of letting her know she isn't alone in struggles without creating more stress on her as she sounds to be in a vulnerable state. I appreciate the fact you are placing her needs first, that in itself is beautiful.Funny thing - I post to this site using a private browser. I don't want it showing up if my kids use my computer to search anything up. Sharing the positive choice of quitting porn requires sharing a past of viewing porn. I haven't even shared with my wife that I'm doing this. I need to do have that conversation. Two months in, and I'm probably on step 4 were this a 12 step program. Step 5 is defined by integrity - admitting to another human being the exact nature of our wrongs.
Any advice in that arena would be appreciated.