How is my ex viewing my texts and deleted texts from her laptop?

About a month ago I went through a breakup. My ex then began to somehow view my texts and deleted texts from her laptop. I then changed my iCloud password. Since she has not been able to view them. I have searched the icloud site and can't find where she may have been viewing them. From what I gather from her, she has an app or something on her computer linked with the iCloud that she was getting it from. Any insight on this would be helpful. Can I wipe everything but my music from my iCloud history in some way?