I had a girlfriend for two years, broke up, next day, "hey herp", "oh hey derp", the end.
Don't think about being awkward, do everything you can to not act awkward, and most importantly if they seem like they start to feel awkward do NOT show any signs of you feeling awkward at all. If you do start to act all awkward it'll just get more awkward and you'll never not be awkward. Quite a few "awkward" 's in this post.