Jealous Bio Mom - AITA

I began dating my boyfriend in the beginning of 2023. We each have children from previous relationships. My son and his daughter are both the same age and were three years old when we met. We did not involve our children into our relationship for about six months and we both made our exes aware before we planned to introduce our children. Both of our exes wanted no part in meeting either of us or cared to have any form of positive co-parenting. That is fine, but it should have been left at that. Unfortunately one year later, my boyfriend’s ex did not like that he and I were still together, despite being engaged to another man. She repeatedly withheld his daughter from him on multiple different occasions, especially when we had family plans. We had to get law enforcement involved various times, due to her withholding their daughter. Well, in February 2024, she decided to become more intense. She picked up her daughter from our home, left, and immediately reported to our local sheriffs office that my son (four at the time) inappropriately touched their daughter (four at the time). This was immediately unfounded, which upset her, so she then alleged there was domestic battery in our home during a specific date in November 2023, which their daughter allegedly just remembered. This was all investigated by DCF and detectives and was unfounded, as well. Although we were all verbally told everything was unfounded, the physical reports took approximately two months to close, therefore she continued to withhold their daughter and we again, had to get law enforcement involved to assist with exchanges. Once everything finally closed out, I filed a report for false reporting to LEO, as these allegations were made to law enforcement, not DCF. During this investigation, I was made aware that she made ANOTHER allegation, stating I texted her threatening messages. After multiple subpoenas, it was proven I did NOT send these messages, well because…I didn’t. The number used was not my phone number. The results came back to bio mom’s best friend and her best friend’s address. Both of these girls are still denying any of this. There are pending criminal charges on them, one being a felony due to all of this. Am I the asshole for wanting to hold bio mom and her friend accountable for their actions?