Should I tell her about him trying to cheat or no?

Sooo I’m 20 and my ex is now 30.

He was 28-29 when we were together and I was 19. So there’s like a 9 year difference.

ANYWAYS.

We dated July 10th - October 24th of last year. We lived together most of it too due to me becoming homeless last minute due to family problems.

He was dating someone before me, and left her to be with me. (We never did anything romantically or sexual until he ended it with her.)

In October, I went into a deep depression and he started talking to her AGAIN. Behind my back, he acted so caring and like he was there for me until the day he said he didn’t want to be together anymore. I didn’t know why and I kept begging him to talk to me and to work on us. Until two days later, on October 26th he told me he was seeing and talking to his ex again.

I lost everything for that man at that time. I started doing me, I would go out and I finally got my belly button pierced after he told me it wouldn’t suit me. I began sleeping on the couch too because I wasn’t sleeping in the bed he would fuck her in, just hours prior.

Well, November 13th of last year I got the keys to my own apartment. I moved out and didn’t look back. We didn’t talk after I left and it was like neither of us existed to one another anymore.

Now fast forward to now..

Almost one year later, he is still with his ex from before me. But recently he started texting me, talking about hooking up and things like that. I’m not very interested but I just wanted to talk to see how he was doing. (He hated his job a year ago, and I was curious if he was still at it mostly) and he kept reverting to wanting me to send him naughty pictures. I wouldn’t.

I found out he is still with her and I don’t know if I should tell her what he’s doing? I have screenshots and all because it has all been through text.

But she hates my guts because he left her for me originally. I’m not sure she would believe me even with screenshots and it’ll probably cause drama and I don’t want to be tied up in it.

She’s probably around 23-24 and she’s got a 5 year old child that is not my ex’s child.

But she acts like she’s still in high school with the drama she brings.