One of the things I've noticed over the years is how my weight changes when I'm in a relationship compared to when I'm not. When I'm single I seem to naturally lose weight and then stick at about a size 14-16, which is about right for my height and build etc, however when I'm in a relationship my weight steadily increases and the biggest I've been was size 22-24. I don't think its about eating either, as I eat the same, exercise the same, I think its psychological. I think I feel invaded in some way, and my place in the world less, so I have to physically take up more space, until the relationship ends and I go back to my normal size.
Whilst I realise it happens, I don't really understand it, do others have a similar thing?