Beauty, puppy is always right! you have told him of your boundary, and now its time to snap closed and let him truly feel what having a wife who wont be in an open marriage really feels like. Pull back and start to do things that will convey the message that you are moving on.
Maybe you shouldnt have shown him your vulnerability right then, but its passed now and all you can do is make sure that it doesnt happen again. That desperation is not attractive and it wont win you any points in the "grass is greener" department.
I guess I gave the wrong finger to the wrong man...