Decades ago three people independently said to me, "I've known you a long time but I don't feel I know the real you." I saw I was the common element so decided to change.
I learned social and emotional skills, which took years of social and emotional work. It didn't cost time or money, but since I was used to intellectual learning, I often felt hopeless, confused, and other emotions I'd never felt from learning. Most things I tried didn't work, but some did and I kept at it.
After a few years I found myself saying how nearly all my relationships after that work were better than nearly any relationship before -- with friends, family, girlfriends, coworkers.
I've concluded that the problem wasn't my work situation or social structures, but that no one taught me social and emotional skills of self-awareness and relationships. In the past, we learned them through things like sports, arts, free play, and other performance-based activities -- the things schools increasingly cut in favor of things amenable to standardized tests. I don't mean art history or art appreciation, but creating and expressing yourself where others will judge your painting, recital, stage performance, etc and you learn to handle it. Nor do I mean sports where adults control everything, but challenging yourself to improve, recovering from loss and failure, etc.
My publisher framed my book Leadership Step by Step https://www.amazon.com/Leadership-Step-Become-Person-Others/... as a business book, since it will probably sell more that way, but it's the book version of the course I teach at NYU to develop these skills. My point is anyone can learn social and emotional skills. When you do, relationships improve and increase in number when you want. People who do the exercises consistently tell me they thought they couldn't learn these things, especially not in a classroom. I felt that way when I learned them. I wish I'd learned them as a child, but it's never too late to learn them.