Hi TOC,
I don't know if you will get this in time as you are probably still in the air.....
Have you thought of the possibility that he is at home waiting for you?
Why?
Because he ALREADY knows that YOU know...
Why?
Here's my thoughts;
He knows he sent the message to the wrong person, now at the time he will have believed that you hadn't seen it, convinced himself the he was clever and quicker than you, but I don't think that will have lasted long. I think you inadvertently threw a few red flags at him and over the past week they may well have been shouting at him (and I know I may be making quite a few assumptions here);
No sex night before trip - is this usual for you two?
You were "blue" and thinking about your meetings the day you left - again is this usual? The "blue" and the emotionless hug you gave him as you left may have seemed very strange to him especially in light of how excited you may usually be about work trips.
No contact after you left - by what you have said this was very unusual for you. you had time to talk to a work colleague but not text or talk to your husband - to someone who is feeling a bit uneasy this may be a huge warning light.
Your first text didn't say sorry - again something you admitted was unusual.
Your contact with him has been matter of fact, no love you's no missing you's etc - but he would notice this as, as you have said, you always say them...
I don't know your usual level of communication during your previous trips but, just guessing from your posts that you are a very loving, caring and strong person, and my guess would be that there would usually be a fair bit of contact between you - again the lack of this may well strike him as strange.
The abrupt change in itinerary, you strike me as very organised and competent, yet you didn't arrange the London Hotel?
Now I may be way off base here, but if i am right and he knows you know, what does that mean?
It means that he has his answers ready.....
I think one of three things will happen
Admit all. Throw himself on the mercy of the court. I can't help you here, I have never experienced this....
Minimize. Bluff, bluster and bullshit until he knows the extent of what you know and then admit to only what is impossible to deny.
Complete denial. Heres what my WW would have said;
" The "in you" text? of course that was meant for you, I got the idea from blah blah but when you didnt answer I thought I'd upset/disgusted you so I rushed home and I thought you hadn't seen it and then I had second thoughts of the innapropriatness of it so I deleted it to save us both the embarrassment"
"That number I've been contacting? a friend of a friend/new work colleague/someone who is going through a nasty divorce/terrible time/blah and as I have been through it myself, hell we both have, i thought I could help him"
"The IT text? I don't know, it was from who? Oh wait, yeah it was asking about the ballgame/betting run/christmas/holiday gift for you"
However it all turns out, I hope you get what you need. I wish you the best.