It's not your circus anymore. She might have set you up to see stuff, she might not have. I know you cant avoid stuff. The kids need their tooth brushes. Mine I needed to refill the hand soap, and she had stuff under the sink. I understand you can be going about things, and are bound to "find" stuff inadvertently. I understand the pain.
One thing that resonated with me is "Be the Duck" When you see a duck, on the surface it looks calm, peaceful and upbeat... under the water it can be freaking out and thrashing about, but you dont see it.
We had to set up a schedule, especially with the kids. GAL. If your with the kids, get them out of the house. Picnic, park, playground... get out and have fun. Give her space. If she's got the kids, get out... Gym, bike etc... UK.. Hmm... Pub?
Your now "Busy"... ALL THE TIME. Make plans... It's hard. Think like a single guy that's NOT on the prowl. New hobbies, activities.. you need to be a better you. Do stuff you've always wanted to do.
I find listening to Les Brown on youtube helpful. It's only temporary.