I completly agree with oh vair oh. A horse doesn't "love" but show respect to us as masters and leaders. My horse will takes his head when I'm scratching and gently lay on my chest, they're not saying "I love you" but saying I'm in submission to you and I trust you. If you think about it, since horses are prey animals, they are taking a big risk and putting themselves in complete vulnerability to show you respect. I know horses aren't dogs, and shouldn't be treated like dogs; but when a dog rolls over on its stomach it's not saying "scratch my belly" it's showing respect to you by making itself completely vulnerable to you, the master. Because if a dog is standing up you can't easily get to the vitals and is harder to attack and kill it. But when it rolls over on its stomach they expose their vitals and are putting themselves in submission to you and showing you have all the power and authority, I respect you, kill me if that's your will. Wolves to the same thing in wild pack to their alpha male or female. It's a sign of respect. Same with horses their is definitely a bond, no doubt in my mind. But it is not a love bond, it is a respect. My cousin's horse WILL NOT let anyone but my cousin ride him. I believe that's a resect and a bond. Do we want it to be that "love" bond, absolutly! Even I want it to be. I dream of being able to communicate with my horse like the way Penny Chenery does in Secretariat when she stares into his eyes and he understands what she's saying. But the reality is that your horse doesn't love you. But that doesn't mean it doesn't care for you. You can't spend time with your horse expecting "love" because you will be dissapointed everytime. And for those of you who say the only thing horses care about is food. My horse will NOT TOUCH his food when I'm next to him. I'll go into the stall even after I just poured his oats and gave him hay or in the middle of his eating and give him a rub down on his neck and he'll give me all his attention and THEN eat after I'm out of his stall. That's respect!
So just my 5 cents worth. A horse doesn't love you. But, there is a bond, and a respect, and definitely a relationship.