She's spent years perfecting her ability to mask her emotions so no one can see what's really going on behind her eyes.
It's February 14 and she's miserable, but no one at the Daily Planet would know it. Jimmy wouldn't know it. Clark wouldn't know it.
They wouldn't know that she stayed at the office until the middle of the night doing nothing, just not wanting to go home alone, to be alone.
They wouldn't know that when she finally did go home she had collapsed onto her bed and wept until there was no more liquid left in her system.
They wouldn't know that she hated herself, and Jimmy and Clark in that moment.
She hated Clark for making her love him. Or maybe for not loving her back. Probably both.
She hated Jimmy for making her care about him. She hated him for leaving her because she couldn't give him more.
Mostly she hated herself. For not giving Jimmy more. For not being able to get over Clark.
But most of all she hated herself because even know as she clutched her tear soaked pillow, even know she loved him, and no matter how hard she tried she couldn't even bring herself to regret it.