Ex partner sends horrible msg

My partner broke up with me 2 days ago by msg, nearly after a year together because of her insecurities of me not being okay with certain things and telling me I need to drop my boundaries!

Anyways I didn’t end up replying to her msg breaking up with me; thought what’s the point, when she msged me and didn’t even bother to call and do it.

Fast forward to today, she sent me this long message abusing me that I caught up with my ex when we were together in a group!!!!! That never happened i was always with ny partner! I would never do that, I have never given her any reason to not trust me! The message she sent me was horrible saying she got it from a strong source? And that I’m a terrible

Person and she’s found so much information about me…. I am honestly lost for words.. why would she do this? When none of it is true.

I haven’t cried after we broke up, I feel a sense of relief , but the only thing that’s on my mind is the fact she is saying things that aren’t true and I feel she’s attacking my character.