Trust me no wuffo gf/wife will be ok with it unless you spend same amount on her like others have said here. I once made the mistake to choose a girl above skydiving and promised myself i will never do it again. After that when i met a girl i would told her straight away what my passion is and that will not change. So then few years back i met this awesome woman who promised me she will not take my skydiving from me, (ya right thats what they all say in the beginning). So the one weekend i took her with to the dz and she did not do one but two tandems. The next time she came along again and did her 1st jump course. I didnt thought that she would carry on skydiving and was just doing it to impress me. Well i was so wrong, she's already planning on what rig she's is gonna buy when her current rig expires in 8 years. We are at the stage that she is the one complaining we dont skydive enough and we should be jumping more often. I could not have asked for a better wife(yes i did marry her) and skydiving partner.
So to get back to your question, get a wife/girlfriend that is just as passionate or even more about skydiving than what you are.