I’ve just read this thread again and Melba you were certainly right when you said all the signs were there. They really were. It’s so odd that after a year of dating this man you stuck to a pretty rigid pattern of Mondays and fridays with very few overnighters. Yes it’s possible he could have had to work on Sats but you say yourself, he had last Saturday evening earmarked for seeing friends. If he’s too tired to make time for you after a busy day at work (which he also does on Mons and Fris by the way, so that makes no sense) why on earth would he be up for seeing friends? Especially when he spent no time with you over Christmas. Christmas Eve was a Monday. Did he come over then? What about the Friday when you started this thread? I’m assuming not.
So your twice weekly booty visits have been pretty easy to postpone when he can’t fit them around a busy week yet he has time on the Saturday between Christmas and NY to see friends. What about NYE, what did he tell you his plans were then?
Also it’s odd that you didn’t know of his Christmas plans until one week before Christmas. After a whole year, you didn’t discuss Christmas with him earlier? 
I’m getting the feeling that you’ve always placed much more importance on this ‘relationship’ than he did, and wife or no wife, he saw you as a casual FWB, no strings and no discussions about moving things forward to the point where he actually has to behave like part of a proper couple.
I think your willingness to accept this from him for so long has made it really easy for him to lie to you. Anyone wanting a casual affair that’s easy to keep a secret must thank their lucky stars when the meet someone so gullible and so content to accept crumbs and ask no questions. Or at least not push harder, sooner on the things that just don’t add up.
I suppose my message to you and anyone else who calls someone their ‘boyfriend’ or ‘partner’ when their relationship looks like this, is even if he were not married, and not lying to you, a man who keeps you at arms length for so long and compartmentalises you from the rest of his life is NEVER going to marry you. NEVER going to move in with you. NEVER going to decide to get more serious. Never going to grant you full access to his family and his friends. Because you are nothing more than a minor distraction/comfortable habit until someone more important comes along.