You keep attracting married men because you are sending the message that you are open and willing to deal with their BS. You are right in that a man that is separated is still a married man. Men will approach you when they feel you are an easy target.

Why do I keep falling for married guys?

Women fall for married men for a variety of reasons. They may have low self-esteem and feel theyre not attractive to more suitable partners. Some fear commitment; if they select someone whos out of reach, they wont have to face rejection should the relationship end. Married men are inherently less demanding.