The second that the dynamic of " you and me vs. the problem" is lost, the first thing that should be attempted is to get on the same team as your partner again. Having a problem is not the same thing as having a fight or even an argument.
As long as we are working together we have tackled every problem we have encountered so far. The real stumbling blocks come when we find ourselves not cooperating.
The only dating advice I have is to go on more dates if you want to not be single.