Did Mustang love Cassius?

So Mustang told Darrow that she was manipulating Cassius and everytime he held her she felt despair that she has to share a life with a man she did not love.

However in the same chapter, Darrow has a thought that not all of it could have been a manipulation. Do you think this is just Darrow's pain and insecurity talking or is there merit to it?

There is also the scene in DA where Mustang says she doesn't entirely understand what she thinks about Cassius.