Hi
Not sure of your age and taking a wild swing at this , but you maybe entering or going through a transitional period of your life . For myself I entered on at the age of 48 and I just feel I am getting out the back end of it now at 53 . I won't say getting back to normal , because the evolution results in change in your thinking . It's a bit of a painful struggle I have to say , but although the jokes of having an affair or going and buying a red Ferrari with the stereotyped "mid life crisis" are not that accurate for most . There are many of us that go through an adjustment . I also found that for the first time in my life I began to contemplate what I might want , instead of always thinking what everyone else might want before my own interests . I think this stuff all comes to a head because of many factors , not just one thing . But your not alone in your thinking if this is the reason why you feel this way . You have to dig through the emotions and decide what is good and worth keeping in your life , then fight your inner demons to keep those things . If you do then your relationship may actually become even stronger . It may not be a bad thing to gently discuss your struggles . I hesitated to do that as it was always my job to be the rock in the storm . I found by actually saying I was struggling my partner really stepped up and helped me through a tough mental period . It made that process bearable and I feel I have come out the other side of the storm a better person .
Or you may just like being on your own