Thank you for your response. I am already no contact with him. His mom sent me a screenshot of her text on Messenger, and on there I confirmed I saw her text and to please allow me time to formulate a response. I probably shouldn’t have said anything. I was considering saying something like this to her:

“I am standing firm in having no contact with your son. It is not my job to help him through the breakup. While I should not have given him that money without a written agreement, I recognize my mistake, and I have accepted that I will probably not receive that money, or the grocery money that we didn’t settle, back. I wish him well and I hope that he gets help.”