Why did my ex send our texts to his girlfriend?

My ex blocked me after his girlfriend and I got into a verbal altercation over something petty. I never had my ex number but he called me from his number to join in on it. Before I could say anything I got blocked. The next morning he unblocked and texted me. I texted back then he made it seem like I was texting him first then sent screenshots of the conversation to his girlfriend. She called to tell me to leave him alone and stop texting him? He could've kept me blocked or told me to leave him alone. He didn't block me until I told him to.

Why did my ex send our texts to his girlfriend?
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