what is the normal amount of times a week to be making love 41/2 years into a relationship?

i'm a women loving a women for almost 5 yrs now. for the first 3yrs i made love to her only. i opened myself up to her aug 12th of 08 for the first time. its only been 14 mths and we make love once every 10 day to 2 weeks at a time. i moved in with her a year ago and everything has changed. the quality of the sex is wonderful but it gets less & less frequent, aso has the affection and intimacies between us. this has never happened to me before in my life. i'm sad. sooooooooooooooooooooooooooooo, is it normal to have sex only onec 0r 2x every 2 weeks so early on in a relationship?
please help. starting to think that this is normal for everyone......when i know it isn't.
thanks for listening,
"the LADY"