Should I remind you?!

Is it true that guys just simply overlook their feelings and don't obsess as much as girls do. Does the saying "Out of sight out of mind" apply to guys? Or is their lack of effort proof that they're not really that interested? Don't we want someone who's willing to chase us? Or do guys brains function differently? Are they interested but life just gets in the way? Are they afraid of rejection? If we don't hang out or talk do they just forget?