Cynical
Meta Knight could not accept that someone liked him. What were his motives? What was to be gained?
When Kirby would try to latch onto his hand or cuddle up with him as he was dozing off, it usually ended up with Meta Knight having an epileptic episode and drawing his sword on the poor little puffball. He didn't mean to, but he wasn't used to anyone being so close to him unless it was to attack him. Sometimes he actually believed Kirby was only trying to warm up to him so he could eat him (which, in truth, was a legitimate concern among the smashers)
But with each passing day, he began to relax around Kirby, seeing him as less of a threat now that he took a good look at him.
And one night he fell asleep on the couch during a movie, Kirby came to snuggle up with him, and he didn't even notice.