In general, I feel the problems in relationships seem to point to something bigger than a specific reason, or list of reasons, which are often cited as the cause of the relationship's demise. I believe there are three keys to relationships. First and foremost, love is action . Without action, all you have is words. It means instead of talking about something, you have to show it.
Words are nice and sometimes beautiful, but without any substance they are just words.
The second aspect of a healthy relationship is feeling special . This encompasses so many things and is so important. No one in a relationship wants to feel like they are just fitting a generic role. If you feel you could easily be replaced, things aren't so good. The third aspect is a bit of a spin-off of the last one, but it needs special attention.