It sounds as if he has closed his heart to you. Some men seem to have the ability to turn on and off their affection at a whim. If it's as you say and he's living in his house with no past, it's obviously someone who prefers to have no attachments emotionally to people or things. Based on what you've written about this guy, he has no life, no friends. He sounds like those guys in high school that decided they were done with you and "broke up" by not calling or even acknowledging you, only it's the middle aged man version.
As hard as it may be to hear, you need to get out of this relationship, there is no future. If he's done this now, while you are dating, to try to force the issue, would be a disaster. As for your child, you seriously need to think about how your dating life affects his. I honestly believe that you should never introduce a person into your child's life until you are engaged. Use a longer engagement period to introduce them and slowly let a relationship form. You brought this man into your son's life without a solid, lasting commitment from him. Now that he's gone, your son doesn't understand that what's happening here is between adults. He will probably feel a sense of abandonment and might even think your boyfriend leaving is his fault or something he did.
I'm sorry, but accepting an apartment from your boyfriend was the wrong thing to do.
I think what you need to do is first forgive yourself your past mistakes. If you believe in God, ask for forgiveness and from that truly believe that he's taken that away from you. After that, look forward. Take each day as it comes and try to make each day better than the one before. If you have a positive outlook on life and appreciate the things you do have, rather than dwell on the fact that you have no man in your life, then you will attact good people to you. If you do meet someone you like, TAKE IT SLOW. Love is not a race to the finish line. Really get to know someone, everything about them, get to know their friends, their family and their life before making major life changing decisions.
You will recover. There is an excellent book called How to Survive the Loss of a Love. http://www.amazon.com/Survive-Loss-Love-Peter-McWilliams/...
A friend gave me this after a bad breakup. It helped me work through all my feelings in my own time. That friend eventually became a boyfriend and eventually my husband. We've been married nearly 12 years.
K.
SAHM to 3 ages 7, 5 & 3