Husband has sex with porn, not with his wife

My husband of 26 yrs has been diagnosed w/ ED. He is on medicine for arthritis too. Dr gave him Viagara. I found this out by accident. He has been watching porn sites while using the Viagara and he gets off. However, he will not have sex with me at all(has been 3 yrs now).Last time he could not finish and he was so beligerent about this. I know he is not cheating with another woman but I feel he is emotionally cheating on me.I try to bring it up and he refuses to discuss it at all. I am at my end's wits. I feel deprived.I do not know what to do. Any suggestions?

Give your husband a choice. Ask him if he wants to

1. divorce you, or
2. see a sexologist and learn to have sex with you again or
3. accept that you get a lover.