SF man, you're a portly gentleman, but I wouldn't say you're morbidly obese....comeon!:
(I hope you don't mind that I found this pic hovering around the tfp)
Plus, as everyone has said before, you've got the greatest smile ever. Don't ever discredit yourself, or question the intentions of your SO if you know her well. Most of us could stand to lose a few pounds or tone up, especially with my long streak of inactivity!!! But just keep doing what you're doing and you'll be fine.
Good luck!