The part about being able to focus at your girlfriend’s place is interesting, because I experience the same thing. When someone is sitting near me and working at the same time as me, I don’t go on all my usual distraction tangents, I actually get stuff done. I think it’s a subconscious fear of being seen as weird or unproductive by someone I care about, when we’re both supposed to be working. Maybe having a “work chaperone” is the solution for us?