I don't really think so. The Starks were no family to Theon. They weren't even nice to him. Abusive at worst and cold at best. Except for Robb, that is. But Robb's like a 14 year old kid, and brotherly feelings for one person between people who hate you and will kill you immediately if your other family - to which you have no contact at all anymore - steps out of line, is not a great situation to grow up in. In fact, the Starks basically stole any chance of Theon having a family (not that I blame them. It's war and they didn't treat Theon badly for a prisoner. It's just nothing close to a family situation, while at Pyke Theon had at least his mother and his sister who loved him...or would have had). Lets also not forget that "family" and "family ties" mean a lot in Westeros. Even if they're a bunch of assholes to you, you don't just abandon family for your best friend (not that Theon could've gone back to Robb anyway).



Theon's story arcis essentially about how that he is completely lost and has no place to belong to (can never be a Stark, his family doesn't care about him anymore because he lived with the Starks). He's desperate for a sense of belonging (which is also one of the reasons why he tries to take Winterfell by force to begin with). It's also why he latches himself that much to the Reek persona ("Reek belongs to Ramsay and Ramsay belongs to Reek"). It's all rather tragic.



(By the way, he actually never swore fealty to Robb in the books. He did in the show though - and Theon genuinely cares for/liked Robb either way, so it's still a very personal kind of betrayal.)