She doesn't think about him often, but sometimes he will creep his way back into her mind, and she wonders about him.
How is Dean now? Where is Dean now? Sometimes she even wonders if he thinks about her. It was a petty high school relationship, that is what she tells herself, but she knows that's only how it started, then they grew into something more.
When she does think about him, she replays the last time she saw him and thinks of other ways their parting could have gone. She wonders if she'd never met Logan, or even Jess, if things would be different.
She keeps these "thinking sessions" short, or at least tries to. Sometimes they last for seconds, sometimes they last for hours, pondering Dean Forester's life. She doesn't tell anyone, not even her own mother to whom she tells everything.
She doesn't think about him often, so she'd like to think.
He thinks about her often, and regrets every time he does.