dashingscorpio makes a very good point!! Couples that support each other (and keep on open line of communication) will have an easier time coping with life's difficulties. Arguments about financial woes and trust issues seem like potential blowouts, yet a couple who is willing to invest quality time and genuine effort into a heartfelt discussion has a much better chance of overcoming these issues and growing from them!
A dreadful daily routine can also cause a relationship to feel "stale", no matter how much you may love someone. Therefore, it's important to spend time with your partner doing something spontaneous. Take a walk together, go fishing/hiking/swimming, challenge each other to a cook off, or even try building something together. Exploring new activities with one another will help strengthen your relationship (as well as break the monotony) ;)