I feel your pain. Access and loneliness are a major worry (I’m just about to separate)
I’ve never been away for more than 1 night at a time in 14 years. My wife is more independent.
Talk to her, perhaps write if talking doesn’t work. If you crash, if you can’t be the best father you can then in the end the kids will suffer too… hopefully for them she will respond.
I plan to spend a lot of time in the gym.