I'm pretty much the same as your girlfriend in this situation.
We started dating, and then I put on weight. For me it had little to do with birthcontrol, as I've been on it for acne since I was fourteen.
There's a line in a Barenaked Ladies song that goes "She's like a baby, I'm like a cat. When we are happy we both get fat" I've noticed that a lot (not all of course) of the very comfortable people in relationships put on a bit of weight. Not nearly as much as either your ex or I did, but still some.
It's difficult to get motivated. I don't know about your girlfriend, but going to the gym makes me feel even worse about myself, and then I eat more. Walking tends to be my only exercize, and now after a year or so of being overweight, I've decided to do something about it.
It's hard for us. Be patient.
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