Trapped because can't afford to divorce him

After 32 years of marriage I found out about my husband's 10 year affair with a woman he worked with. That was 3 years and we have been separated since. He has insisted all along that he never considered divorcing me and has always loved me. According to him the affair was just about sex and his selfish desires for pleasure. Eighteen months ago I discovered he was communicating with a woman from a different state where we had lived twenty years ago. After confronting him he eventually confessed to having many affairs for the past 26 years. I had become a stay-at-home mother when our second child was born 22 years ago. At age 57 I have no job and no income and 22 yrs since my last employment. I would not be able to support myself financially if I divorce him. I feel like I am trapped in a marriage with a completely untrustworthy man and no realistic option to leave. Can you address this frighteningly real aspect of so many wives staying in marriages because they simply can't financially afford to leave?