How do you politely reject a birthday gift from an ex you're not over without appearing weak?

Anonymous
Long story short my ex left me for another but I made a regrettable agreement to remain friends after a couple of months after the break up.

Now a mutual friend told me that she's prepared a birthday gift for me a week early and I just can't deal with anymore sentiments.

How can I do this without making it awkward?
How do you politely reject a birthday gift from an ex you're not over without appearing weak?
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