I went to your profile and can't tell what your situation is or whether you have kids with this cad.
So I'm curious. Does he offer you a lifestyle that you can't possibly attain on your own? Like, a summer home in the Hamptons?
He seems to be addicted to disrespecting you and putting you at risk of stds. I would worry about keeping your self safe instead of wasting worry on him.
Who cares if he is a sex addict or not. Why are you still with him?
Leave the diagnosing up to a professional and leave.
It is clear he has some issues.
No he is not a sex addict but if he is cheating on you why stay with him?
I agree with Chima7
I really think the bigger question here is
Why Are You With This Man ?? ??
You should leave this situation and seek therapy for YourSelf to understand why You would be in a relationship such as this in the first place - in order to make better choices for YourSelf in the future.
Love IS a choice - Don't stay in an unhappy, dysfunctional relationship
He sounds like a pig. If you know he's cheating and having unprotected sex with multiple women then dump his loser butt. Kick him to the curb! Whether or not he is a sex addict is pretty irrelevant given his selfish and unacceptable behavior. Get rid of him before you get infected with an STD. I hope you will get tested for everything under the sun once you get rid of him because for all you know you could already be infected.