I wasn't aircrew, but there are many similarities to the situations that many servicemen find themselves in; it's also relevant to mention that the OP may find himself in a command position, where the boot is on another foot and he may find his flying programme about to be impacted by someone's real-life. I had a Sgt, who's wife was absolutely fine with him going away, but he would fall to bits and would turn from an excellent tradesman, into a significant liability the moment we drove out of the camp gates (he also didn't last long).
In my case, SWMBO Mk1 couldn't hack it and our marriage crashed and burned after 7 years. SWMBO Mk2 was very supportive and our close-family stepped in when I was sent off at a moments notice.
To the OP - It needs a lot of thought and both parties need to really consider the implications of what is being taken on; best of luck for the future.