I doubt that it would be, but I think if we import the female Mage, it would get mentioned. No matter, I just would like to hear about his time in Kinloch and how he met the mage, either gender, if you import that. If not, just learning of his time there would be nice. Much like getting to know his thoughts about Hawke and about his/her decision to side with the Templars or Mages.
I want to actually know about this guy and his thoughts, especially now we have a chance to spend more time with him. So if the infatuation is brought up in passing, then fine. The fact that he only mentioned it once in DA 2 suggests that he is still somewhat in pain but probably started to move on from it. Though...did they say it was a crush or that he actually fell in love with her?
If you look at his codex in DA2, it will give more of a perspective. But, he stares up at the sky wistfully and longingly as he spoke fondly of the female Amell. Granted, only a year or so had passed since he was in Ferelden so it didn't bother me too much, then. Now, any longing in his voice would really creep me out and cause me to seriously question mental state. I'd be afraid to romance my Inquisitor to a guy who, after an entire decade, still isn't over the girl he barely even spoke to. He can speak of the warden, yes, but it should only be with respect, not longing over some old time crush. It's not normal to dwell on something like that.