I like that old Swedish proverb, "Shared joy is a double joy; shared sorrow is half a sorrow". I believe life is better with someone to share it with but it has to be the right person, if not it becomes more like purgatory. Also, I've found relationships are like boot-camp for learning more about yourself.
I love how you put it! Very true. They can be very valuable insight, even otherwise wrong relationships. Everything can help us grow, in the long run :)
P.S. it s a great proverb.
I think people come into our lives to teach us specific lessons. Lord, have I had an exhaustive education in my life! Lol.
It's my favorite proverb. I found it in 2011 when I was writing my best man speech at my brother's wedding.