Betrayal is a fascinating subject to write about, due to the fact that there are so many different ways people (and therefore characters) react to it. Including a surprise betrayal in your manuscript can be a brilliant plot point, but it is also a great opportunity to show your character's emotions. Betrayals can range in their degree of severity; they aren't always huge things.
This week, try including a betrayal of some kind in your MS. Put some thought into how each of your characters would choose to react, whether it's curl into a ball and retreat or lash out at others.
I have time this week to do a few query letter or Twitter pitch critiques, so if you'd like fresh eyes on yours, please let me know in the comments! #PitMad is this Thursday; if you want your Twitter pitch critiqued in time to use it for that, let me know!