At the end of Game of Thrones season 1, the Dothraki were supposed to make a choice on whether or not to follow Daenerys. And in season 2, some of them made the choice to betray her, but I don't suppose all of them?
Now, in season 5, we see the Unsullied and the Second Sons, but not any Dothraki followers. Did I forget some part of the series maybe?