They were each others morale committee. It didn't always work but they tried.
If she were down he kept her entertained or found things in his travels about the city that might intrigue her.
She would rub or scratch his back, tell him her take of some of their funnier missions and she would make love to him until that was all he could think about. She did it for herself too. Without him the future was too bleak to imagine.
0o0o0o0o0o0
She wanted to know when their status would change from MIA to 'who cares we've got other things to do'. Sam remembered when SG-11 went missing. At first a flurry of activity, it was everyone's prime concern. But with months of 'no sign of them' the base, as a whole, moved on; there was a war to fight. There were other pressing matters that took precedence. And, yes, they were forgotten; they were forgotten until Sg-1 learned how Apophis' Jaffa had captured and tortured them and finally killed them, millions of miles from home.
Jack conceded they were in a jam and they would probably have to get themselves out of it. But on the bright side there were no Jaffa or Goa'ulds or Replicators.
He heard her cry that night and it hurt as much as their abandonment by the SGC even though he fully understood. He felt her tears, her pain, was the direct result of his ineptitude – he was a failure.