@Notrueself, You are right, it was a no brainer!
From everything I have read in this thread that you shared, I don't think your reaction is due to past relationships or that you are over reacting . He does sound passive aggressive to me as well, but there is not enough information here to say that with certainty.
Behaving differently public and private, (great he was so good taking care after surgery) combined with not selling the vehicle, not finishing projects, needing a shop to do the promised projects, and more all sound like someone I have had a relationship with that is definately passive aggressive. That was the first thing I thought when I began reading your post One indicator of PA is when you feel angry and guilty at the same time. ie Angry at their behavior and then guilty because maybe you are being too hard on them, expecting too much , not really their fault, etc.
If that is the case, counseling can even be very tricky. They can be so nice, so agreeable, and after all, all they want to do is please you but these misunderstanding and extinuating circumstances keep getting in the way. They always have some explainable logic why they didn't finish the project or sell the vehicle. Either something came up, they didn't have the right equipment, or it is just a simple difference in thinking, they forgot, etc. Example in therapy: (I was waiting to sell the suv until near our anniversary because I was planning on buying my wife this wonderful gift with the money). Now who looks like the meanie? usually the same one feeling guilty. Not that this is your situation. Hopefully, he does not do these things but if he is passive aggressive this way, please do everything to learn about this and take good care of yourself (don't buy into the self blame or undeserving stuff) .
If he uses passive aggressive communication as a primary style of communication, therapy may be very difficult. (even with a skilled therapist) Direct honest assertive communication on your part may not do anything to encourage him to do the same. Some people really do not know that they do these things, they are really in denial but their big fear is you having the upper hand. They secretly do not want you to get what you want, for you to feel too comfortable and secure about things but even they are not aware of doing it intentionally. They will absolutely deny breaking the vacuum when you ask them to help with housework or not finishing the job for months being anything but accident of forgetfulness. Often, they provide just enough to keep their partner in with some hope, but there are an awful lot of disappointments.
I hope that you find a good therapist for counseling and hope that you share how it goes. I will be praying for help for you as understand how this can play into the ptsd negatively. If you discover he is passive aggressive and need to talk, feel free to message me, I have had decades of experience with this but most importantly, compassion.