I put up a similar thread awhile back. It gets hard when there is nothing distinctly ‘wrong’ with the relationship (you get on, sex still happens, things get planned, you dont argue that often) but complacency is almost worse. It shows theres no spirit or passion. Mine, after really thinking it through, was down to her illness that would mean we would never really live a life I wanted. Selfish yes, but just over a month on and I wouldnt go back. It was not something I could change and not something I could change my feelings on so I had to say enough is enough. She will meet someone who loves her for who she is, not who I wanted her to be.
However, its important to talk to each other. There are a variety of reasons you can be feeling this and the human mind has a way of making everything fit to what you believe it should be. The more downbeat you think and persuade yourself its dead in the water, the more you will want it to end. Surprise her, wine and dine her somewhere different, quiet, set aside a whole evening and turn off your phones. Go back to basics, not sex, just talking and sharing ideas.
Expectation vs reality too, what do you expect of the relationship now? What is realistically going to happen next? Happiness is that place between expectation vs reality. Its not about how many good points they have, its about how many negatives you learn to accept.
It is just a combo of hormones, dosent have to end here though.
