What should I do if I opened the marriage and now my husband wants a baby with someone else?

We opened our marriage a few months ago due to mismatched sex drives. At first, it seemed to ease the tension between us until he told me he got someone pregnant and wants to be involved in the child’s life. I never wanted kids, and now I feel completely blindsided. He says it’s up to me whether we stay together or not. I’m lost. Has anyone been through something like this?

What should I do if I opened the marriage and now my husband wants a baby with someone else?
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