I think this opportunity came up for you at the right time and for the right reasons. First - you need to let your landlord know that you need to move - this will save you money & reduce some of your stress.
Our tax system here is different. I claim our property tax on my income tax but Josh & I don't claim anything together. For you - I would seek legal counsel WITH Gabe there. And in that situation - you ask the lawyer whether it would be advantageous to be married. That puts it out there in front of Gabe. It would be a way to find out your legal rights & make your preference known. That outs the ball in Gabe's court. That is what Josh & I are going to do.
No one could have been more overwhelmed than me with the last 2 moves. We had masses of stuff & the move north included selling & moving from 2 houses! It can be done!
This is the time to enlist some help then attack one room at a time. Get rid of stuff now. Have a garage sale or sell some stuff on Craig's List. Throw stuff out. Donate stuff. It is costly to move things so why move what you don't use.
Just get lots of boxes & totes. Make a plan of what you need & what you don't need. Label everything & start immediately.
I think this is the change you need to propel you forward. I'm hopeful for you!