You'll have to leave him to do what he thinks will make him happy. Stay out of his way. Fighting him or showing your anger will make it worse for you and the kids. He will act happy around you but not his real feelings show.
In my case, my W will act happy around me and my S11. She is not happy. Admitted to S11 she sits alone in our old packed up home and cries from the guilt.
So, you have to focus on your own happiness now for your kids. If it get too hard for your H, then your kids will naturally want to spend more time with you and your H will see that. He has to see the consequences of his actions. You make it good for your kids by being as strong and accepting as you can.
Here's how you react around your H... be friendly not a friend and businesslike and brief. Otherwise, do not communicate with him unless he communicates with you first.
I often can't do it either. I'm so sorry this is happening. Tell your gf what you're doing regarding the above and ask for her support. You are not alone. You can do it.
Last edited by HPoirot; 01/03/1501:28 PM.
Me: 44 W: 45 S: 11 Married: 15 Together: 18 BD: 9/29/2014 OM discovered: 10/16/2014 I left her behind: 12/14/2014