The day I sold my one gelding, Zayn, (we were moving) we went and hung out in the pasture for an hour, then when I loaded him up he was hesitant and when the new owner drove off Zayn cried/whinnied the whole way down the road. This was a horse that wasn't herd bound and loaded well into whatever trailer. I didn't cry right then, because crying is looked down on in our family, especially about an animal. I cried later when no one was around.
I would say that Zayn and I had a strong relationship, and I would even go to say that he loved me almost as much as I loved him. I miss him a lot!