From intimate romantic partners, to friends, family, and coworkers (and everyone in between), interpersonal relationships are the foundation of human life. Relationships are the most significant sources of love, belonging, and satisfaction..and can also cause disappointment and pain. But we literally can't survive without them. Learning how to navigate relationships and develop positive and healthy relational patterns are an important key to happiness and well-being. 

It's not just a cliché - you really have to love yourself is a good article explaining why.