Aitah for not giving my ex-husband back “his money”

My ex husband cheated on me 5 years ago and I found out when he texted me instead of her. That ended our marriage but the divorce was amicable. I told him that I couldn’t forgive him and he said he was sorry and we moved on. By that time he had worked a small fortune, a company, three commercial properties and a lake house. I got half of everything and I am a silent partner in his company, getting returns twice a year. As an apology he also gave me our apartment and the lake house. It goes without saying that I don’t need to work but I still do because I love my career.

He moved on with his affair gf. I don’t know much about them since it still pains me but all I know is that they’re still together. She contacted me on LinkedIn telling me that since the divorce has cost him so much money he has told her that he never wanted to get married again, nor move in together. And she blames me because I took everything. She is now pregnant but according to her my ex said that this wouldn’t change his attitude towards moving in together or marriage. So now she is accusing me of being a theif who is basically stealing her baby’s chances of having a family. I didn’t need the money because I have a good job and everything was my ex husband’s. I took advantage of him because he felt guilty.

I haven’t spoken to my ex in 5 years. I haven’t even had the strength to answer him back every new year to tell him to stop texting me “happy new year” because that’s when we met. I don’t know what to do. Is she right? Or should I ignore her?

Edit: thank you everyone for the fast response. I was considering one of three options, tell her off, tell him/forward her message to him or ignore and block her. The majority are suggesting the latter and I am inclined towards that too

Thanks and have a great weekend. I will try to read all your comments but they’re coming too fast. Sorry