I was married for 26 years. My husband left me three years ago for a woman with young children and last year they bought a house together. He says he has no money to help me, but while I spent last Christmas in a flat on income support he took the family to Florida for the fourth time.
You could seek a divorce based on either adultery, unreasonable behaviour or desertion, and you will be able to sort out your financial affairs at the same time. If your husband has spent your joint assets on a house which is providing a home for young children it may add complications, but you may well be entitled to capital and/or maintenance. See a solicitor as soon as possible.