Harry actually surprised me a bit in this. But in the end, I like this aspect of his personality a lot. I think that if Draco had responded to his old lover with something other than annoyance and nonchalance, Harry might have reacted differently. As it was, Draco has made it clear where his heart lies, and Harry can hardly get mad at him for having other lovers, having had several himself.

Thank you so much for such nice feedback. You've made my night.