Trust

My husband really disappointed to me tonight. I am trying not to cry about it but how does one go about trusting a person when that trust has been broken by them and I don't mean in a fob the incident off way, I mean in a huge punch in the chest way.

A little background story I guess.. we belong to this adult swingers website. Our account is joint, you know a couples account and well over the pass few months he's done things and said thing that have upset me but I have always gotten over it eventually but tonight and after a big discussion that had followed a huge argument we had about a week ago, we agreed and I mean "we" agreed that neither of us would go on cam unless we go on together as a couple or if we go on singly then both cams would go on or if other other person said go ahead it's okay but in the latter instance the other person had to ask if it was okay and not just assume.

Anyway tonight my husband did just that, the latter. I caught my husband camming his nut-sack around a beer bottle, which if he had of ask if I minded then more than likely I would have said "knock yourself out" but he took it upon himself as always to act before thinking. 

Now forgive me if I'm wrong but if the other partner is unaware that their partner is showing more than just their face on webcam that constitutes as cheating. 

I guess it's like this, my husband who I love with all my heart has just fucking cheated on me by showing his fucking genitals on cam behind my back since I had no knowledge he was going to do it! 

And since my husband and I have already discussed what would constitute cheating when it comes to "the website" then his act is classed as cheating.

How can I trust him again?