@dianag78.dg , I know this is really heart breaking but you need to be strong for your son. Your WH is NOT a good father, good fathers do not blow up their families running around with other women.
You need to get rid of this POS, he is a serial cheater and sounds narcissistic.
1. Start doing the 180 for yourself to start emotionally withdrawing from him. Do not listen to anything he says. Cheaters lie all the time. He will tell you what you want to hear. Remember if he really cared about you he would not have done what he has done twice that you know of, could me many more.
2. Go see a lawyer as to what your options are and get your ducks in a row and plan your future
3. Try and get yourself some sort of job or go back to school so that you are not dependent fully on him.
4. Start taking care of yourself, exercise, gym, join clubs where you meet others
5. Tell all your family, his family and friends and blow up his world. You do not have to keep this secret for him. This stuff needs to be exposed as it only thrives in the dark.
6. Tell the OW's spouse of bf if any
7. Rely on one of two close friends for support.
8. Start working on getting him out of the house. See what your lawyer says
9. If your kid is old enough tell him what is happening. Kids will sense these things. Do not hide. it is better that your son is with a mother who is alone and confident and healed than a mother who is constantly looking over her shoulder waiting for the next catastrophe to arise due to her WH philandering ways, do not do that to him or to yourself.