Is it bad that I blame her for ruining our relationship?

12 days ago, my boyfriend and i was video chatting his so called pregnant baby mother cussing her out. Mainly it was me because i wanted her to stop contacting him. Anyway, i asked him to asked her for $100-$200 for my hair and he did (she didn't know it was for me) but she didn't send it. She told him to kick rocks and that we should be ashamed of ourselves playing on her phone and we're already together. Our main goal was to get money out of her. He tried to invite her over so i could fight her too for lying on him the second goal was to get her upset to where she lost the baby.. I told her i will hurt her and her mom over the phone. He didn't say anything. So i figured he wanted me to. Either way, after that, we had been fighting a lot afterwards. Our relationship is ruin because of her! All she had to do was not sleep with him. Now, we're not getting along. I almost killed him 2 days ago for talking to another female. Im so upset. 12 years of us might be gone done the drain. Is it bad that i blame her for ruining our relationship? I cry every day and it seems like he don't even care about me anymore. Im thinking about cheating on him as well. But i don't think that'll work.. since he's mostly with me for my money and having a baby with another female for tax money.
Is it bad that I blame her for ruining our relationship?
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