You know we got your back and support your decision, OP.
Power to the outdoors! Live the life you desire. I congratulate you most of all for choosing to stick by your GF and work finances in the name of love. I hope to keep my Z forever, but if the day comes, I can see myself (I don't care if you guys make fun of me) sobbing like a 6 yr old as I trade her in for a more practical vehicle.
My thing is, I absolutely LOVE hearing old (60/70 yr old), car enthusiasts talk about things like "...back in my day, I had a 69 Mustang! Whooo! Red paint, leather seats with racing wheels......". I can definately see myself doing the same thing in my later years with the Z if I have parted ways.