Being the spouse of a sex addict is not an easy place to be. Sex addicts are usually that way due to major emotional issues that started very young. It doesn't have anything to do with you, though you will have to work through major issues of your own due to his infidelity. He will have a long hard battle working through the issues he has. I would suggest you also get counseling. It will be rough for a while but will get better. I suffer from depression, am a recovering sex addict. I understand what you are going through. My husband and I are still together and I have been "sober" for many years. It can be done. Have faith.
Gayle