When I am away for longer periods of time my cat can get pretty lonely, she is not alone, but I think that she is the most attached to me.
She is normal when I come back, save that she wants to spend even more time with me. I end up snuggling her in bed, and she is nice to spoon with. Even if she does enjoy touching your face while you sleep.
When we first left on vacation I was expecting to return to a super annoyed cat that wanted nothing to do with me. When we can in the door she was waiting, and after a wiggle she jumped up onto my sun burned arms. It was painful and heart warming at the same time.
She has never taken “revenge” like some people have suggested she would. Which I think means that she really loves me as much as I love her.