None of us can be pretty sure of anything. When I pull the rug out from under my own beloved wife (soon!) I'm sure she'll invent a girlfriend (she is already constructing a narrative around someone I have never met) in order to soothe her tattered ego and excuse the fact that I simply didn't want to be married to her any longer.
Maybe this guy is just stressed with the idea that he's going to have a baby and needs some time away. Don't fill this poor girl's head up with mystery supermodels yet. She'll be throwing in the towel by this evening.
M:40 W:40 2 teenagers ILYBNILWY: 09 January 2010 soon to be walking away my situation