The song "10 Things I Hate About You" by Leah Kate is about a past relationship that ended due to the partner's infidelity. The speaker caught their partner cheating and, despite their pleas of innocence, decided to end the relationship. However, the speaker still struggles with missing their ex-partner and decides to make a list of all the things they hated about them in order to move on.

The lyrics of the song reveal the various flaws and negative traits of the partner, such as selfishness, being jaded, talking a big game, but failing to back it up, being toxic and untrustworthy, having mommy issues, and being a bad lover. The speaker also mentions their ex's wealth and use of it to buy their way out of problems, as well as their lack of responsibility and unchecked behavior.

Overall, the song is a cathartic way for the speaker to express their feelings about their past relationship and move on from it by focusing on the negative aspects of their ex-partner's personality and behavior. The list serves as a reminder of why the relationship was ultimately not worth continuing, and why the speaker deserves better.