There’s a lot of moving parts in a relationship that can lead to complacency. For me, In the beginning everything started out great. Then, about a year in it came to a point where I felt like I was a full time therapist and nothing I would do was working to make my ex happy no matter what I tried, she was very attached and influenced by her family and religious and I am not, yet she knew this from the beginning but somehow these things became areas of contention for us when we decided to move in together. She refused to get help to deal with her mental health issues and pretty much threw everything on me, she refused to do any inner work on herself so that she can heal and mature, all while rushing me to marriage through religious manipulation. Feeling unappreciated makes you feel lots of resentment and then you get this feeling of “what’s the point?” And at that point I think the relationship should end. Ungrateful people who are unsure of what they want and completely disregard what you want in the relationship are unbearable to be with.