problem.....

Okay, so I have a situation. When me and my boyfriend were together, he asked me to pay his car insurance, since he was short, and he said he'd pay me back in time. Well, we're not together anymore, and my mom looked at my bank statement and she saw the money I took out for his insurance and she wants me to get it back. She said that she wrote a letter and provided a money order form for him so he can pay me back. She said this way I won't have to see or him from him. She hasn't given him the letter or the form yet. She's waiting for me to say okay. But I don't want to do this because I know he's going to confront me about why my mom is doing this and not me. And since we're broken up it's just weird and awkward. I don't even know if he will pay me back. I'm not someone who handles confrontation very well. And I'm afraid that this will take things south, and he'll confront me about it, and it'll get worse from there. But at the same time I'm just so done I don't want the money back. I'm at a point where I don't care how much money I've spent, I don't want him to pay me back because I just don't care. My mom keeps talking about it and how I need to do this, I know it's my money and I do deserve it back, but i know if I let her send the letter and money order, I just know he's going to confront me about it, and I just don't know what to do. I don't want my mom to be involved in this because it's none of her business, but I can't budge her out of it. I'm literally the definition of stupid. I don't want things to get worse than they already are. I don't know what to do.