I have just three things to teach.

“I have just three things to teach: Simplicity, patience, compassion. These three are your greatest treasures. Simple in actions and in thoughts, You return to the source of being. Patient with both friends and enemies, Your accord with the way things are. Compassionate toward yourself, You reconcile all beings in the world.” ~Lao Tzu
Life is not as complicated as we make It out to be. Relationships aren't as complicated as you think. You're either attracted to the wrong persons, not willing to commit, or you have deemed your partner inadequate or not worthy of your respect.  It could be your chosen partner is guilty of the same. Perhaps both of you suffer similar dispositions. Patience, consider the value of your time as well as your partner's. If you have little or no patience you have low regard for others. Compassionate towards one's self breeds compassion for others. It is difficult to receive what you are not willing to give. If you lack either of these dispositions you are not ready for relationships with others. You are  not in harmony with yourself or others. You will invent reasons for discord. Learn these three things and everything else will fall into place.