The Veda teaches us that the content of life is to commune, to have shared experiences with others. Art, music, poetry, dance, theater, and other forms of expression are created so that communing can occur and connections are experienced. Life would be boring if we were unable to connect and share the things we enjoy. When we have shared experiences, relationships form and life becomes interesting.
Relationships, whether they are human to human, romantic, friendly or not, human to pet, human to God, human to plant, or human to object, are necessary for evolution. However, the mistake we often make is when we perceive relationships as a place to find happiness and fulfillment. This can never be the case.
If we look to another person or another thing to give us happiness, we are looking to accomplish the impossible. And vice versa, we cannot possibly make others happy. To behave or to remain a certain way in order to please another is exhausting and unnecessary.
What we can do though, is work on expanding our own consciousness, find happiness within, and then bring that happiness to others. If the person you are relating to does the same, the relationship will grow to a place of creation and expansion for both people.
If we are happy, any relationship we are in, will be happy. If we are miserable, any relationship we are in, will be miserable. Our relationships simply become a showcase for what we feel inside. If we begin to look to someone or something else to make us happy, we must correct the intellect. We study a philosophy of life that shows us that happiness is not dependent on anything outside of the Self and begin to teach ourselves that happiness lies within. When happiness is found inside, communing becomes an enjoyable shared experience.
