Tracy,
Here we all are and here we all are to stay! Be so proud of yourself for knowing that be involved with a married man, hurts so many including you.
Never put yourself in a position to be second best. You will find someone who says the words I love you and you are beautiful, and this person will be free to say them and truly mean them.
Get yourself a little calendar and write down your thoughts on each day. Give yourself a big star each day you don't contact him. And when you are ready to tell him, that you don't want to hear from him anymore, that he is married, and you don't want his wife hurt or anyone else, give yourself three big stars.
Yes, you are thinking with your heart and your heart is so good. In your heart you never want pain and suffering to be in someone else's.
Hang tough and love yourself and I bet each day, you will get a little stronger. That's not to say, there will be days of utter sadness. On those days, pull out that journal, come here and visit us, and all of us will be right here.
You don't want someone, who is able to be with his family and sneak off to make a call to you, just to keep you on standby.
Bless you sweetheart - you are on your way!