What can I do if someone I know is slandering me in messages to my boyfriend?

[Kayla]

I was recently informed by my boyfriend that he received a message from a former friend of mine on Facebook about 3 months ago.

In the message, she told him that I had cheated on him and that I had genital warts- both statements which are completely false.

She and I had a tumultuous parting of ways which nearly involved the authorities which my boyfriend was aware of. He tells me he doesn't believe her and imagines that she is doing this out of spite, but I'm so worried that he doesn't trust me.

I'm familiar with the process of reporting harassment on Facebook, but since it wasn't harassment aimed at me, I can't do anything personally. I don't want to ask my boyfriend to report her (but I really wish he would) and would love any and all advice that you can give me for this dilemma.

Thank you!