My ex got me pregnant and then left me for his baby mother he keeps begging me to keep it why won't be just leave me alone?

His baby mother is his doormat is he expecting me to be like her if I keep the baby? We live together until our lease ends in January there has been a few times where he would ask to have sex and told me we should be able to have sex If I'm pregnant with his child I always tell him no
My ex got me pregnant and then left me for his baby mother he keeps begging me to keep it why won't be just leave me alone?
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