If you are old enough to ask this question then you need to practice good communication skills. You have been together long enough where you both should feel free to discuss any problem you have in your relationship. You may be pushing the relationship too fast for her. If you haven't had a sexual relationship and you want it to start she may not be ready for this. If you are talking about a future with her then she may want to stay independent for awhile longer. She holds the key to your question so start by learning how to communicate and you do that by simply asking her what she means by that comment.
You slow down. Talk. ask why. Communication is the key here
She is confused as to what she wants so beware if she asks you to do something as she may be upset afterwards and regret it.
If mean she/he wants you as a girlfriend/boyfriend
she wants to be with you forever/ your relationship is forever
that the time is not right and she wants to wait.
This could mean a few things. Maybe she's not interested in you anymore. Or she has feeling for someone else.
Sorry sweetie. She just wants to be friends with you.
She is two timing you.
He likes you but doesn't want to or he has a girlfriend.
it can mean many things depending on the relationship you already have with the guy. barely know him?.. then he means he wants you sexually. very very close friends with him?... might me just sexually, but he could mean that he wants to have you as his, he might want to have you as his girlfriend. but what if your alredy dating
It means he wants you, but he has a girlfriend.
that she wants you to think shes pregnant.
If your girlfriend says 'If I can't spoil you who can I spoil' she simply means that she wants to lavish you with all of her kindness, affection and attention. She feels that there's no one else she wants to do this for; only you.