After breaking up for more than four months, I texted my ex-boyfriend to scold him.

Don't worry, it's not mental illness. You scold him just to show that you still care about him after breaking up with him and are jealous of his new girlfriend. In fact, if you think about it, will you feel very happy when you see that the person you like can be happy? In fact, you don't have to cling to your previous feelings, and it's not good to find a real happiness by yourself. I believe you will also find your own happiness.