I guess I have to be thankful. Both partners I've had in my flying career love flying. My wife is proud of us owning our Mooney and loves to fly in it, even the fact that we 'll have to shell out a lot of cash now for the engine revision has not really dampened her comitment to stay behind me here. I know I am lucky.
My first partner many years ago was more than happy to fly with me in my C150 at the time and we went all over Europe in it.
I hear a lot of negative things from others however, most having been said here already. I also think it is not a pheonmenon restricted to aviation but more of a general problem. Relationships today do often take on the character of a battle for dominance and a total lack of mutual understanding for the other's interest and needs. Even the very popular "try before you marry" option today is not foolproof, many partners change radically even during the honeymoon, once they got the papers signed.
Another issue these days is that many of us are simply overworked in all regards and can not really enjoy anything outside work anymore. It is sort of understandable that after collapsing on the sofa on Friday evening, some people won't simply have the energy to accompany their significant other for whatever pursuit they wish to share over the weekend and their idea of quality time is to finally get the sleep they lack from the 18 hours days they put in over the week.
Before I decided to go back into aviaiton after a 7 year hiatus I talked about it with my wife and she encouraged me, a bit to my surprise as she is usually economical with our finances. Yet she determined that I would be much nicer to have around if I have something to balance from my otherwise very stressful life and she'd not mind the occasional trip to the med herself. The very idea to be at the beach after 2 flight hours became pretty attractive to her as well.
I reckon communication is the most important bit about all of this. Make your intentions and wishes clear, and try to sell it by getting her to see what is in it for her. If all that does not work, then then it is a tough decision to take.
Best regards
AN2 driver