Biting: Is it Agression or Love?

I have had Jack now for 2 weeks. Its been bittersweet. I have a reason to come home, to clean up, and to not shop my life away; but I also feel I am missing out on the single life because I have him. I come home, he runs to me and meows. I pick him up and the kisses ensues. " I love you Jack" I proclaim and then boom! He squirms and wiggles and scratches my hand and bites in between my fingers. "OUCH" I yell and then he looks at me perplexed.  I put him down and then he stares waiting to attack and in minutes; I notice some nibbling at my toes. Why Jack why? My hands and arms used to be soft and even toned, now its filled with battle scars; clear evidence that I am losing this war. I guess he could be giving me material for my next interaction with the opposite sex or he could be marking his territory therefore ruining my chances at a potential love interest. I end up looking at him and sigh, " Jack, you make me look like a scorned woman" he stops for a brief minute then licks my wounds.