I'm in love with a married man. His wife is comfortable with me(I'll explain that). So, will he leave her 4 me?

As long as his wife lets him do like he is I very seriously doubt he leaves her. Why would? He's got the home life and the single life going. You're not being selfish. You're just being in love. I would advise tellin him how you feel and what you expect out of the relationship. If he's not up for it then I would move on cause you'd be spinning your tires and getting no where.