The suggestion about getting free time with a solicitor is a start. Also ask your doctor for counselling help. They might suggest Relate. They have recently helped my daughter.
25 years ago, I left my husband after 20 years of marriage. I saw a counsellor for over a year before I made the decision. She was brilliant. Listened and listened. That's what you need at first. We could all suggest things to you but it's you that has to carry it out so you decide. The solicitor will point you in the right direction legally. The counsellor will give you the strength to make that decision.
Good Luck.
I was by myself for the next 20 years. Had a couple of relationships but then (6 years ago) I met an old boyfriend who I knew in 1968. We married three years ago after I moved to live with him.
I've got another 'keen'... Ouch!