Should I give him another chance?

My fiancé cheated on me and the other woman is pregnant. I’m pregnant too, 17weeks. We were due to be married in January. I have two daughters from previous relationship that I had to leave because he was extremely abusive to me and the girls. My fiancé had become a dad to my daughters. I’m having a baby with him and I’m just crushed. Should I give him a chance. I love him but I don’t know how he could do this

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