Later on I'm going to call my ex-girlfriend an idiot for getting back with her abusive boyfriend
Why are you going to call her names because of this?
I find it incredibly stupid to be with somebody who hits you.
It's wrong to verbally bash your ex girlfriend because you are upset with her choice. Doing this will make yourself seem cruel and untrustworthy.
I don't think that is true. I think I should tell her how I feel.
It would be best to approach your ex girlfriend with tact and consideration, rather than tension and cruelty.