Sorry, can't see why situation III is so bad. I generally like the fact that I like spending time with my husband. On the other hand, I can almost imagine the 'and then zombie apocalypse happened and she had to bash his head in with the frying pan' end of story. What exactly did you have in mind?
when I spend time with you, I like you more --> when I like you more, I want to continue our relationship --> when we have a relationship, I spend more time with you
The potential badness of this loop makes a lot of sense to me.
Growing familiarity can, and often does, lead to growing affection. This doesn't necessarily have anything to do with long term compatibility. So, you can be in a 'hang out with --> like --> hang out with more --> like more' loop with someone with whom a long term happy relationship would be improbable.
Attachment ca...
I have moved this post to my blog: http://squirrelinhell.blogspot.com/2016/10/internal-race-conditions.html