There is nothing wrong with selling a horse you aren't clicking with and take a break from horses all together.
I love horses, but they aren't the be all end all for me. If I got out of them I think it might be a bit of a relief, I own a boarding barn, and it's a lot of work, especially now that it's winter, so my perspective might be different than others. I know when I boarded my horse, I enjoyed the horse more as I could come out, love on her and go home. And if it was rainy, muddy and cold, I could just stay home!
Don't get me wrong, when the weather is beautiful and the trees are all in bloom and the barn and yard are spotless and the horses are grazing or laying in the sun and I'm in a chair relaxing, there is nothing better in the world! I don't slag on my duties in the bad weather, just appreciate the nice days better. :)
But anyway, I could take a break. I would miss them, but there would be no stopping me from later getting back into them. You could do the same, take a break if you want, be it for a month, a few years or the rest of your life!