He sure is acting like a piece of crap right now. I'm am so tired of the two Bi*#%es he calls his support system. While he was looking at our furnace that stopped running today one of them sends a fricking text. I know they have to know his every move because he is in constant contact with the 2Bs. WTF that they can't let him alone while he is here. He did find me sitting on the kitchen floor after crying. I can't take much more between this crap, work and the holidays. H will be taking Ds to his mom's if the heat doesn't come on.
Do they know he was with you? Probably not. I'm quite sure he lies to them about you as much as he does you about them.
I can see how frustrating it is becoming. I'd have just called someone to fix the furnace and not worried about having him work on it. Have you tried doing something different as an experiment to see how he responds? Sounds like he's enjoying the 'on the fence' life.