It is the psychological bonding that is the last bond to be broken before couples actually break up and go their separate ways. If he is still with her, this is almost guaranteed to be a part of the reason, and as long as he is in the home with her, this will not change.
So all the above being said, it boils down to this fact; if he were going to leave, he would have left already. If he were an honorable man, he would not be stringing you along and lying to his wife. The fact that he is still living in the home while pursuing outside relationships is a key indicator that he is not leaving. If he really wanted out of the marriage, he would have taken the necessary steps before he met you.
If you need a little more incentive as to why it won’t work out with your married man; of the less than 20 percent of men who actually leave their wives after cheating on them, less than 10 percent stay with the woman that they left their wives for. Once again, the odds are not in your favor. Ask yourself, do you want the type of man who would lie to get you in a relationship, cheat on his wife, and continue lying to you so that you would stay in the relationship?
Do yourself a favor. Make life less stressful and remove yourself from the situation. You don’t want to be labeled a home-wrecker, but that is what you will be if you continue down the path you are on.