Have namechanged for this but am a regular - I also want to stress that I have not been unfaithful at all.
To try and cut a long story short, DH is jealous of a man (I'll call him X) that I work quite closely with - he goes on and on about X all the time, (half-jokingly) accuses me of having an affair with X etc.
DH was obsessed that X would come to my works christmas do even though I told him that X wasn't booked on it so he wouldn't...X did turn up for about an hour as the venue was quite near his house.
When I got home and DH asked me if X had turned up, I am
to say that I lied and said no as I couldn't be bothered putting up with all the comments/accusations if I told the truth.
Me and DH have now been invited to a colleague of mine's birthday party in a couple of weeks - the circumstances of it are such that we can actually both go, both drink, have a night in a hotel without the DC (the first one since before DS1 was born over 4 years ago) so I am looking forward to it...however, I just know that DH will quiz my colleagues as to whether X went to the Christmas do (as I say, he is obsessed!!) so what do I do??
Admit that I lied and that X went or have our first night out ruined when DH finds out I have lied and make it look that there is something going on 
I feel so stupid now but DH's jealousy really annoys me and I just didn't want to deal with it.