As for the business...leave it as it is...if you can work when he does fine or if you can schedule yourself to work when he isn't there...even better....
DON'T try and engage him in any serious talk...the business can be dealt with IF it needs to be later...
DON'T express your emotions....when you do it seems needy and pathetic...or as my H felt....guilt...he felt I was using guilt to get him back...guilt about my living situation, about the kids, about finances...these were REAL things but he thought I was just trying to make him feel guilty and he refused to have any part of it...
Just leave him be....most A's don't last...they are built on disfunction...if you fight it he will defend it...if you ignore it he might take a hard look at it and eventually see it as it is...
I know 2 weeks wasn't fair....but in reality he probably wasn't/isn't ready to WORK on this marriage...and until he is all you can do is work on you...
Now about how to make those changes...practice with people around you...even strangers...when someone cuts you off or is rude to you...STOP...and make sure you respond in a nice way...think maybe they are having a bad day....feel bad for them...but resist the urge to say something back...
If there is a discussion with someone and you asking questions...make sure you don't re-ask the same things in a different way....take the answers they give as what they mean...and let it go....resist the urge to be right....the more you practice this with everyone the easier it will be to do this with H...he is "tired" of the conflict...and if you truly look back and put yourself in HIS place....you will be able to understand...this doesn't make the A okay...it doesn't excuse it...but it does make you own your part of the M and why it is broken right now....
When you are in his presence...be more cheerful...hum a happy song if you have to....read joke books...watch funny movies to get you in a positive frame of mind...if he says something to you....just accept what he says...resist the urge to analyze it or question him about it....if you are out together...do as you have...work on being more outgoing...if it takes a glass of wine or a beer well then do that....it won't hurt as long as you don't over do...and sounds like you know how to handle it okay...
In time...try and be just a bit mysterious...sensuous...maybe dress a little sexy...go get a massage to make you feel great...
You are right in not involving others...it does make it VERY hard if there is a reconciliation later on...and you don't need that friction....
YOU CAN DO THIS....make a list if you need to....remind yourself each morning that you have positive changes to make for YOURSELF today...don't let anyone, anything distract you from YOUR PERSONAL MISSION...being the best person you can be...it is NEVER too late!!!