I am sorry for your current struggle. It's hard when someone we love doesn't love us the way we had hoped they would.
I am also unclear as to whether you are still legally married? Or just living apart?
Please, may I ask you this first:
You say you have started your own business with money your parents lent you? Your income is high ($300,000 a year?) and this seems like a very solid salary to live on comfortably with your children. Does your husband have any legal ties to your business? If he doesn't and you're divorced, then you are free to spend your own salary the way you want to . There should be no legal or financial tie to him as long as it wasn't part of the divorce decree. But if you are still married then I have no idea what your state laws say about the finances and who gets what. I would seek out an attorney for answers on that.
You were kicked out of his office? Do you have any legal rights there as well? Any financial rights to his business?
Also, you say you want to stay together for the children. I will be honest with you, that is probably the worst thing you can do for them if there is no love, or respect and no relationship left between their mother and father! What kind of example are you setting for them if they grow up watching their parents struggling in a loveless and disrespectful marriage? The best thing you could do is to either try to reconcile together in counseling, or leave him and find yourself a man who will love and cherish you and show your kids as well that two adult people can and do love, respect and trust in one another and grow in the same direction as one, not separate and apart. Your identity is NOT in your husband , but in who YOU are as a successful business woman, mother and most of all, woman! You have done well in your business! You should be very proud of that! That takes a lot of hard work and dedication! Good for you!
I urge you to put yourself and your children first here. Get out of this loveless marriage and find a man that deserves your love and will cherish you. And be honest with your children, they're smarter than you think they are. It's simply a fact of life; people get divorced. Tell them that you will always love their father, but sometimes married people cannot live together and the best thing they can do for themselves and the family, is to make sure everyone is happy,and that two, happy, parents living apart is better for all.
I hope you get the life you deserve! Blessings!