Mongo has it right... balance is key.
I am very fortunate in that my girlfriend figured out really early that my training is part of what makes me the kind of person I am. She doesn't try to change me and supports me very strongly.
In fact, when I take days off to dedicate them to her as a way to balance my time, she always pushes me to go train anyway.
This fall, we're taking a vacation together and I'll be training in a dojo the entire time we're away.
I always do my best to repay that kind of support, even though she always seems surprised that it needs to be repayed.