The Bravery - Honest Mistake Lyrics Meaning

This is one of my favorite songs. It's also a song that's extremely open to interpretation, because besides the chorus, there's only 2 different, short sections of vocals, with very ambiguous lyrics.

The way I interpreted it, there's a guy and his girlfriend he's been with for a few months. They're in bed, having sex. Suddenly, he shouts out the wrong name. The girl in bed takes offense, and thinks the guy is cheating on her. He tries to convince her that it was just an honest mistake, a slip of the tongue, which it really was, but she'll have none of it. Over the next few weeks, it spirals out of control as her paranoia increases. She checks his e-mail and looks through his mail, and looks for any signs he's being unfaithful. Finally, because of his perceived unfaithfulness, she breaks up with him. The guy is left wondering how something so minor could lead to this, and is brokenhearted because it was all just an honest mistake.