Most Helpful Girl
It's never nice to say that to someone. Remember, 2 wrongs don't make a right. I'm not yelling at you, I can totally understand why you did that, and I think many people would have the same reaction in that situation. But you asked if it was "good" for you to do that, and the answer is no.
Most Helpful Guy
She's a heartless bitch that will always have a shitty relationship so just completely delete her from your life. Email, cell phone ( including block her number ) and all social media. And if like most woman she can't stand you ignoring her and tries to get you back for her own twisted satisfaction then continue to ignore her. She's not gonna change but instead hurt you again.