Husbands Sexuality Confusion

Hi all. I’m unsure where to turn as I have no one to talk to other than my husband about this and I’m feeling quite alone.

Recently I found out my husband has been talking to people sexually online specifically other men. Up until a few weeks ago I was under the impression that he was completely straight but now I’m finding out he’s feeling really confused in his head. He explained that he’s romantically and sexually attracted to women(specifically me) but he also feels sexually attracted to me but only online through chat rooms. I am totally okay with him being bisexual and having these feelings but the deception of sneaking around online and sending photos to other guys has left me feeling really alone and unwanted. I have had a heart to heart with him and tried to figure out how he’s feeling and trying my best to help, from what he has said it seems that he isn’t wanting to be with a man physically and he doesn’t look at men and fancy them but when he’s online and chatting to them it really gets him going talking about the other guys fantasies and what they want to do with him. It’s completely sexual

I’m doing my best to be understanding and help him through this but I feel I have no one to talk to and no one to help me with how I’m feeling. Has anyone been through anything similar that could maybe talk and make me feel a little less on my own and lost. 
He has assured me that his love, dedication and want to be with me has never faltered and he wants to spend the rest of his life with me but he gets these urges and feels ashamed and disgusted with hismself

Thank you