Ex FWB’s girlfriend text me..was i wrong?

Okay sooo had a FWB a long time ago. He got a girlfriend, didn’t tell me, and then fucked me. I cut him off, all of that. Fast forward a year, wasn’t sure if he was still with her so I reached out to him to be friends only. He said fine. Finally admitted he was still with her. Then out of the blue he text me and said he didn’t feel comfortable being friends with me anymore because I was “rude” to his girlfriend in the past. I blew up, telling him I was only ever a place to put his dick until he got a girlfriend and some other nasty stuff. Blocked him. THEN today his GIRLFRIEND TEXT ME.

I wasn’t going to respond. so I text him and told him to tell his girl to leave me alone. He screenshot the message and sent it to her. She proceeded to call me a coward because I didn’t have the balls to respond to her. So I told her off. Asked her if she was aware of my relationship with her bf and that he left out a few key details. Told her she must be jealous and threatened by me if she had to text me after I blocked her Bf. She kept coming at me so I finally told her he cheated on her with me. She called me a liar. So I told her to talk to him. Blocked her. He text me and called me a lying spiteful bitch that ruined his happiness because I was too unhappy my self. 😤

Was I in the wrong to tell her or to even sink to her level and respond??? I didn’t ask for her to text me, I never had her number, HE gave it to her, or she stole it off his phone, I’m not sure. Ugh. They’re both blocked now.