Felt like, at the last minute, BioWare said '...Oh, fudge! The Champion can have a romance. Well let's throw in a half-arsed explanation and call it a day, not like anyone cares right?'
(Note: I know this probably isn't what BioWare did, but that is what it felt like to me.)
I mean, seriously? Her 'explanation' basically added up to 'Yeah my boyfriend loves me too much so I up and left one night without telling him anything lol' Seriously, HaThat's pretty stuwke? You've fought together before. Demons. Blood mages. Meredith. Orsino. Giant poisonous wyverns. Even friggin' Corypheus! The guy you're supposedly after! How is this any different? 
I realistically can't see them getting back together after Hawke's ******* betrayal. Or if somehow they do it's not going to be something instant. Thanks, BioWare. /s
Imagine it's better for other romances, though. BioWare tends to crap on only the ones I like. From what I saw, the Anders romance had a pretty damn good explanation that I really liked. Too bad I don't like him :/