Drago seemed like a poor match for Dany at first, but they were perfectly suited and between them grew a great love. He seemed unstoppable, but was cut down by a flesh wound. Returned by Blood Magic as a changed being, Daenerys took her husband's life again so he wouldn't suffer.
Tis a big and beautiful world. Most of us live and die in the same corner where we were born and never get to see any of it. I don't want to be most of us.