Theon loves you, that was for sure, since he first saw you he knew he was whipped. But his love for you was proportionally at how stupid and pathetic he became when he was close to you. Besides, the fact that your father was the one and only Eddard Stark made him a little scared, but never enough to stop fighting, that was obvious.
Daily, he would watch you from afar, how you laughed and played with your younger brothers and other nobles, never daring to steal more than a few glances. And when you even smiled at him or started a conversation of just a few words, he would jump and celebrate the whole week just for that.
But that didn't happened very often, what did happened often was him crying and releasing his frustration while talking with Robb, who had noticed Theon's affection for his sister since they were kids.
Theon never was one of show his emotions, but when it was about you it was different. It was like he couldn't even help it, if he wanted to cry, hell, even when he jumped on his chambers until fall asleep was uncontrollably.
But he love you, more than anything, more to anyone. I mean, he even stop sleeping with prostitutes since the last time he talked with him, when you told him that men who pay to sleep with women are nothing more than a bunch of undesirable men, so he started to spend the most of his day training, like now.
He found himself training with Robb and Jon, both knew how much fond Theon was about you. As they saw you, they immediately started to train rougher, but more happily. Robb and Jon even let Theon win.
Now, he was looking at you, convinced on talk with you and steal some of those sweet smiles and pretty glances. "Did you saw me, Lady {{user}}? I beat your brothers."