I don't see what's wrong about being obsessed with your romance. I doubt most of you know what obsession is, and haven't met one person that's obsessed with anything. If I walk in someone's room and they've got Tali posters, stuffed animals, a bed with Tali stuff sewed onto it, etc, then maybe that qualifies for obsession. But killing Garrus so you don't want to see their banter isn't that big. Maybe they headcannon them flirting on vid comms while Shepard is locked up on Earth.
When I was 15, I had a serious near-obsession with a girl once. And I barely knew her. Long story short, my family almost got sued. I was depressed, lonely, a bit emo, and had lacked common sense and didn't really care about my actions. I fantasized about her and made her up in my head to be this perfect girl I wanted to be with, because she was pretty and popular, nice to me, and she made me laugh a few times. That's it. And I remember, as depressed as I was being, sure that she was like, my soul mate.
That was about 3 years ago, and since then I saw a therapist and got some help and got better. And looking back on it, maybe I was just going through a rough stage in hormones and adolescence, plus depression and suicidal thoughts. But I still feel disgusted with myself and feel like a different person now. Like I was insane.
So, that may be a bit off topic to this, but some of you keep discussing being obsessed with your romance, so I thought I'd share a personal experience that's probably worst than most fantasies on pixelated characters. You don't know their story or the circumstances. It could be just a stage.
I'm not saying it's wrong to call out people for being too attatched to their romance to an possibly unhealthy extent, but I wouldn't use the word "obsession" until it loses all meaning.