Nah, you don't want to flat out lie to her. The reason why you'd feel bad is simple, it's wrong to lie. And once she knows you are she'll see through you. Don't feel ashamed youre working, you have do what you HAVE to do. You have to own your job and your responsibilities.
It's ok that you couldn't feign being upbeat. The upbeat part will come when you have found other ways to GAL....that will be the source of your positive attitude. Right now youre probably not there yet because you're still in the stage where just about every thought is on her and how miserable you feel. Its just going to take time...keep on doing what you're doing.
I repeat, well done.
M-34 XW-32 D-7 Found OM's presence 4/09 Separated 12/09 Divorced 8/10 GREAT relationship as coparents since 8/10