this becomes harder and harder as time goes on

i am into a 8 year (come march of 2011)  with my partner.we have traveled and done more together in that time than in all the relationships she has every had.(in all her 61 years ) she has told me this and so has her family.   she says  i dont care for her any more but i still do her things every day. i make he lunch.her dinner. help her clean up after. fix things she breaks or cannot operate. is nasty to me and to others when we re  in public.  is this  one of the ocd  symptoms? dont know how much more of this i can take  and i am at the point of leaving.  any suggestions. ideas?