Let's write!

Yeah, everyone forgets about Lee. I get the feeling that she was happier and more in love with Lee than she was with Shaun. It's also important to remember that she's very different with them. With Lee, she's met the Doctor and he's already helped her grow away from the shallow bride into the mature companion. With Shaun, she's back to the way she was before Lance, the "fountain of useless trivia" he called her. You can imagine that her relationship with Lee, even though it was shorter and in a virtual world, was mature and informed, while Shaun was probably just the next guy who paid her any attention.