over the last month, i was away every weekend and then gone the entire last week...during that time, whenever i was home, my male cat (the uber affectionate one) was a lot more vocal with a lot of plaintive meowing. then, at nite, when i'd turn out the light, he wouldn't leave me alone - meowing nonstop and nudging me. then tonite, he was kneading me and purring, and then lied down on my stomach while i pet him...however, after a while he began meowing loudly again and it was as if he was going to bite me...any insight as to why the change in behavior other than him being upset with my absence? and what is the biting about?