Jen
KurJen - Kurgan Mod
I considered Thane for my second Femshep romance, but his seemingly unavoidable death and Garrus being romanceable in ME2 steered me away from him and towards Garrus.
I have to admit that's why I went for him. I felt bad he was dying and figured he deserved one last romance. But I always held out hope they would find a cure for him before it was too late. I guess we will find out soon since he makes an appearance in 3. I hope it's just not from his deathbed or something like that.