Break up with him. I have a great bonding with his son too. Not Helpful 2 Helpful Being involved in an affair with someone else's husband is an almost surefire trip from ecstatic highs at the beginning to a depressing abyss at the end. All he knows is that this family took me in when mine didn't have time for me and i am treated like one of the kids. If he seems content to let the relationship go on for years as it is, you should see that he is using you for some fun on the side. If he can somehow help you in life by making you more successful, paying your bills, or buying you a home, then you have gotten something to show for your time.
Do not say he will not leave his wife and children, i can honestly say he will.
Benefits of Dating a Married Man
An extramarital affair is way cheaper than a real relationship. If it hurts afterwards, then let it hit. Yes, you are dating him and it is the most beautiful thing that has happened to you but always remember that you are always going to be a secret. I dated a married man for 3 years. If you can't come to terms with the fact that you're the other woman, an affair is probably an even worse idea for you than it would normally be.