Loves Themselves First. Think about it: the old cliché that you must “learn love yourself before you can learn to love someone else” is actually true! Any person must learn to get to know their wants, needs, desires, emotional turn on and offs, what makes them happy, sad, excited, nervous, and so on, is important in getting to know oneself. Only after you know yourself and are receptive your wants and needs can you open up to discovering and embracing the wants and needs of someone else.
Receptivity. A good partner must be receptive to the want and needs or their significant other. They must know how to read the other, be supportive, loving and embrace all emotional and situational aspects of the other person.
Understanding True 50/50. A good partner is willing to put in just as much as the other partner. It is important to understand that all relationships are, indeed 50/50, and neither person should be putting in more effort than the other. Additionally, a good partner would be able to see in imbalance, and is willing re-establish equilibrium in the relationship.
Communication. At the root of most problematic relationships lies poor communication. Not just in what is said, but in what is heard. Always make sure that you are both on the same page about everything, even if it takes some lengthy clarification. A communication problem can spiral out of control quickly, and lead to far greater problems in the future of the relationship.
A Good Listener. The best partner is someone who is not just listening, but is legitimately interested in each and every word of their partner, holding true value to it. It is not just a matter of listening to the other vent, but is also important to put things into perspective, try to understand from their point of view, and most importantly, to simply be present with them.