Try to not let him see how he's affecting you, it's horrible what's he's done to you but no one will replace you as a mother. Try to surround yourself with positive people, family friends. Also have u seeked support from domestic abuse charities cos it really helps to build back up that self worth and confidence and you can finally move on from the bad relationship. Try to ignore what you feel for the new gf, she won't even last that long with your narc ex as narcs cant have healthy long relationships, he will end up doing the same to her what he did to you.
Here if you need to talk, I have an 18 month old and my soon to be ex husband has done the same x
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