I feel so lonely and I'm involved with the wrong person. Help!?

Here's my story... Before judging and pointing the finger, take the time to read. I'll try to make this short. I'm a single mom (never married). I haven't really dated in 10 years, except for this married man. We didn't have s*x, but we were intimate, especially emotionally. I broke off this relationship at least 5 times. Now, he's back into my life. He's a high profile person in the community and he's considered a real "genius" because of all his accomplishments. I feel so hurt and alone because he goes back to his wife even though he claims to be in love with me. I also know that he flirts with other women, just because he can. People will say to date other men, but I don't see any who interest me. I'm in my early 40s so all of them are either married or divorced. I guess I was vulnerable when I met him because I take care of my elderly parents and I need some diversion. My parents' illness is taking a toll on me and I feel as though he's the only person who can stimulate me. I feel so lost, it's not even funny. When we're apart, I know it's the right thing to do, but I still miss him. Help.