I have made multiple comments on multiple posters about the dangers of dating / relationships until you sort your own *&^%& out.. You fall well into that catagory - you ignored them little red flags, and now you are in a situation 10 times worse.
Get your I*^& together, man up and lay down how this will play out - and do not back down from that plan.
Priority 1 - You already have children. You need to sort the existing issues out with them and build this relationship - not with talk or hollow words. Actions... And you start today - quit the "oh i'm confused and im lost BS! - You are a man, a father and you need to own your *&%&.. Not sitting there feeling all confused and wo is me. Priority 2 - GF / Ex GF or whatever you want to call her is bad news.. She probably saw the writing on the wall with these arguments and decided to trap you - Stand by your conviction and walk - keep walking.. When / if your child to this woman is born, you be the best dad you can be to that child as well - Your priority is being a good father - Leave the whole relationship thing behind for a while..Focus on kids - existing and this new child - You do not need to be with this woman to be a good dad. Priority 3 - Sort your *&^* - Get comfortable with being alone for a while - Either alone, or with your children..
You are in a pickle.. Step back, breathe and tackle it rationally - pre nups and marriage to somebody you dont love - WTF - like seriously - All messed up, but only you can control the outcome that is best for you !
Previous username - Helpme123.. A name chosen at a desperate time..
Now Mr Brightside.. coming out of my cage, and doing just fine.