What to do when you are unhappily married and want to move on with someone you feel happier with?

I've been married for almost 15 years, and we have four beautiful children. I have been unhappy for years but due to financial reasons and only having one vehicle that she uses for work because I work from home and watch the kids while she works out of the house. How would I go about getting out of this relationship that I feel trapped in? Should I tell the woman I am interested in about the situation and get her opinion as well?
What to do when you are unhappily married and want to move on with someone you feel happier with?
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