Hi Sweeteewalls,
You have absolutely no reason at all to feel humiliated. You are among friends here on SR. Many of us know exactly how you are feeling. The desease of alcoholism is the pits! Alcoholics do their best to hurt you and make you feel bad because they like to project. If they are feeling like low lifes, they will do their best to make you feel worse.
It sounds like something has happened that hes not telling you about for him to 'blindside' you and your therapist. I wouldnt be supprised if he has been living a double life for quite a while now. There is a thread going about 'acting' at the moment on SR.
I am sorry that you are going through this but please keep going to Al-anon, seeing your therapist and visiting this site as doing those three things will only help to improve your life. You really can go up from here. This man doesnt deserve you, he is a fake and not someone to share your life with.
Your friends will be back if they are true friends. True friends will support you and stick by you no matter what. In the meantime try out a few Al-anon meetings if you can, its supprising how quickly you can get a new support system in place and keep visiting SR, its a great place to offload.