This thought just crossed my mind after re-reading the thread...
@JoshintheDesert if you knew she started affair in April 2023, why did you sign I-751 in September 2023 stating marriage is bonafide?
If you bring this to USCIS, they may (small chance) not only accuse her of fraud, but you participating in it. It's relatively rare but possible to get serious penalties for that too.
This only supports my opinion to get divorced ASAP and get away from this messy situation.
At least I wouldn't drag it.