Could you do a couple of days by yourselves? It really helped us!
Have you expressed your feelings and concerns to him? Is there a way you could figure out the issues like communicating/therapy before it gets to that point of splitting? Personally I would try and explore all options and then at least you can sit there and say you did everything you could and it just didn’t work out x
A tide and true saying I've heard lots is "don't stay just for the sake of your children". It is valid. If you are unhappy and feel like communication and problem solving won't help your situation, your kids need to see a happy mom and dad. It doesn't have to be mom and dad together to be happy. Just mom and dad happy