Would recommend that you read fiction as they capture the human relationships much better than non fiction.
In terms of specific recommendations, you can read Youth and Summertime by JM Coetzee. Both are fictionalized accounts of the author's life. Youth especially captures the narrators failures in love and leading an emotionally fulfilling life. Highly recommend it.
You can also go to a bookstore, read blurbs from novels and pick one that interests you. Discovered Youth that way.
In non-fiction, I have often been recommended the Art of Loving by Eric Fromm. Haven't read it myself but have heard glowing things about it.