Rationality helping in relationships (here used to mean all interpersonal, not just romance) :
Use “outside view” to figure out how your interactions look to others; not only to the person you are talking to but also to the social web around you.
Focus on the goals, yours and theirs. If these do not match, the relationship is doomed in the long run, romantic or not.
Obviously, the whole list of cognitive biases and how to counter them. When you -know- you are doing something stupid, catching yourself rationalizing it and what not, you learn not to do that stupid thing.
Rationality helping in relationships (here used to mean all interpersonal, not just romance) :
Use “outside view” to figure out how your interactions look to others; not only to the person you are talking to but also to the social web around you.
Focus on the goals, yours and theirs. If these do not match, the relationship is doomed in the long run, romantic or not.
Obviously, the whole list of cognitive biases and how to counter them. When you -know- you are doing something stupid, catching yourself rationalizing it and what not, you learn not to do that stupid thing.