My girlfriend is always worrying if I am as happy thought I would be after we decided to go from just good friends to be in a relationship with each other.  I always am honest and tell her the same thing.
Sounds like she has some underlying issues with trust. You may want to sort it all out before you get too involved.
well really we have deeply involed for along time now . And I am very happy in our relationship and couldn't ask for anything more out of it.
Maybe you couldn't but it sounds like something is going on with her. 