very similar here in my world… andrea loves phish and live music in general, it’s incredible to be able to share some of the experiences we have, and many of them are centered around going to shows and the whole adventure that goes with’em. i wouldn’t have it any other way! she’s got a lotta passion for music and we feed off each other in that sense, i love the energy we have together because of that. her dad is an orchestra conductor, she was brought up to appreciate live music. plus, she looks after my crazy self at shows, i need someone to guide me to the gates at the right time, help me walk after shows, etc. 
i do have a decent amount of friends who enjoy the fact that they have phish as “their thing” and their significant others just don’t bother going with’em on trips to shows. it’s their time away from home activity (takes place of hunting or fishing i suppose! lol) and a great release/recharge.
that way still works well for people, as long as the other person understands
however, i was dating a girl just after college who couldn’t stand phish and strongly disliked me traveling to the shows. (she was into country music and such, a farm girl from iowa) i broke up with her the day after i got home from vegas '04. i just couldn’t handle that conflict anymore (along with a couple other things) either way, it was tough to be with someone who tried to make me feel guilty about seeing phish. i mean WHAT THE FACK BIIITTCH 
now… when i couldn’t make it to one night of alpine last year and andrea was there, or when i went to a night at red rocks last minute and she didn’t, you best believe there was some heated words!! lol