I'm finding if I shift my focus away from romance and to my character and the story as a whole I can feel excited about the game again. Of course, that makes it rather difficult to discuss the game in the Cullen thread, since... I'm trying not to think about Cullen 
When the excitement gets to be too much, I just shift my focus to my all-time favorite romance: Garrus!
I loved him in Mass Effect, and I found his romance to be the most..."organic".
ME1: Shepard is Garrus' mentor, for lack of a better word. They fight together, get to know each other, become friends.
ME2: Garrus serves as a link to the life Shepard remembers. He's your friend, and the one that has your back no matter what. When you choose the romance with him, it's more like best friends comforting each other before you might die.
ME3: It's the only time "love" is brought up. And it's when Shepard and Garrus fully commit.
It was wonderful. It took years of growing and getting to know each other before either of you said "I love you". Which I find to be more realistic than one game can give a player.
Aaaaannnnddd to bring it back on topic, I wonder where Cullen's romance will fall in terms of my favorite to least favorite.