hi there jana, i am new to this disease so i only have one relapse to relate.
i live in a house that has three levels - basement, main floor, and upstairs. when i had my attack i gave up stairs for months unless absolutely necessary.
it wasn't that hard adjusting my life to living on one floor while i had to. i slept on the couch but could have set up a day bed off the kitchen if i had wanted to.
but, as i recovered, i kept trying more and more. eventually one day, i thought to myself "i'm going to run down these stairs" and i didn't the first time - but the next time, i did. my point is, the stairs being there, i had to work at getting back to using them.
i would say, live in the now as much as you can. use your abilities for as long as you can! and worry about moving to a one level barrier-free home if and when you have to. just my opinion!
i hope u and your boyfriend have wonderful years together