I've NC for this.
How is one meant to move on? Obviously he still has to see her and be in contact with her as they have DC. It was an EA a year and a half ago. We'd been together just over 2 years then.
I typed out the beginning part of the long farcical tale but I'm an emotional mess at the moment and it just makes me cry 
His ex can be very unreasonable and has caused a lot of upset in the past. She was not happy about him firstly daring to be with someone else 6 years post divorce and secondly having children with me.
I just don't know how to cope with it now. I know I get so unreasonably upset over the little things she does. Her manipulation is still allowed to take place because it's easier for him to deal with that and the fallout at this end than to face her. We had a frightful argument this afternoon over something so trivial but when it comes to her I just see red.
I feel like if he'd just gone out an shagged a random that would have been easier to live with and move on from. At least all contact would have been severed. I feel like I'm constantly on edge, waiting for the next time she's going to try to rock the boat. Also because it wasn't a physical affair he doesn't see it as being that bad but the messages they were exchanging around the time along with his many lies still hurt.
I want to be with him. I want to make a future with him. We have DC together and I am in love with him. Most of the time things are lovely but the moment I just feel like I'm stuck and I can't go on. We talk and talk and talk and talk but nothing ever changes, I tell him how I feel and he understands until he loses patience with me and it blows up like it did this afternoon.
How can I get over it? Would counselling help? He's suggested I see a Dr but I don't think I'm sick, just a bit sad. I'm fine in other areas of my life but this still floors me.