Then why would she still wait at the Eluvian and let the warden go through with her? I guess you could argue she wants him as some kind of guard dog, still, but I think we're stretching the headcannon. If she just wanted to do the DR, she would have split for good like she said she would. She doesn't.
Because every Warden, male or female, is a great warrior who has likely slaughtered thousands at that point, including (potentially) Flemeth. She's in a strange area beyond the Fade and it's likely others will come for her at some point. Don't forget, she only takes you if you gave her what she wanted aka, romance + DR (in my experience, correct me if I'm wrong).
I agree that it is possible for Morrigan to fall in love with the Warden, but only because Gaider confirmed it way back when.
Except it was actually acknowledged instead of completely ignored so it was a step forward.
Oh yeah I always assumed she was lying her ass off so that works. Doesn't explain Alistair though and unlike Anders, Merrill and Fenris he's not emotionally needy enough to put up with it as he shows in other situations (warden having him at hostile).
Well, if you want a reason, how about that Alistair is a virgin who knows he's likely going to die. And, you know, he's down with saving Conner even if it takes blood magic, so I don't see the problem here.
Edit: Ryz, your quote broke. Why you do this? D: