Girlfriend doesn't seem interested anymore.

Recently my girlfriend just doesn't seem interested in me anymore. She is far less affectionate than she used to be, and doesn't say "I love you" anymore. One of the last times I said it, she just replied with "thanks". And just today she got mad at me and told me not to say it as much anymore, because she was annoyed by it. I didn't tell her that all the time, I just try and make a point to tell her I love her once a day, to be sweet. But that's apparently way too much.

I'm scared she wants to end things, but I really don't want that to happen. What's going on? How can I fix it? I'm afraid to ask her, and give her any ideas...
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Thanks for the answers. I'll take your advice and keep you posted on what the results may be.
Girlfriend doesn't seem interested anymore.
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