Feelings
Marg was troubled.
In all her life, people just used her like a tool. No one was there for her, but they always wanted her to be by them, whenever the need occurred: Her family, her so-called friend, were all the same. They just used her and discarded her once the job was done.
But that was why she was troubled when Helio acted like she was doing him some wondrous favor. Helio didn't demand things from her, rather he requested. And more importantly, in her time of need, Helio was always present. It wasn't the same give and give relationship, rather it was now a give and take relationship between the two.
Was it just friendship, or was there more? She didn't know. But she did know one thing, she was troubled.