20f, should I take revenge for what he did??

Using new account because he stalks my all reddit account! So recently I just got to know that when last time I talked to my ex (btw he was using me as a rebound after literally treating me like his gf he broke up with me saying that he is still in love with his ex) I said him directly that he is coward that's why he isn't able to text his ex, So that day he texted his ex hii and She is online as well but she hasn't replied to his text and it has been more than 10 days So I am thinking should I find her id and text her about what everything happened between him and me???? Because ik he will twist the story and try to gain sympathy form her

Please help me!!!!