Oh hun, have you got any people that you could like stay with for a shirt while to get away from the situation and actualy get the support you need and deserve? It's not fair for you or your child to be around him, especially with this arguing. He sounds a bit of w*nker and quite frankly no matter what you didn't deal with in the right way before, if you got back together and both wanted to make it work, then what's in past is in the past. Going behind his back? You gave him enough oppurtunities to tell her himself - do you have a good relationship with his mum/family?
It's a bit immature with him carrying something like this over a whole week and i understand there are many other underlying issues, but if he really means it this time for you to split, then it doesn't mean in the long term he can't be a supportive father to your children... this is obviously just my opinion, but i think you need to grab a friend to go with you for your scan and support you in the short-term tomorro then soon enough (as much as you don't need to get too stressed out right now!) you should [here it comes] sit down and have a civilised chat and try and make rational decisions. Good luck :) Chinnup, i hope it all works out for you.xx