Why does my girlfriend think she's entitled to some of my inheritance?

Anonymous
So, my grandmother passed away last year, and only now has the estate been sorted (A few things had to be investigated).

Anyway, her son, my father, was / is an only child, as am I, so we both inherited quite a large sum of money.

I will be buying a house with mine, and paying off any remaining debts, which will use up about 95% of the money I am earning.

Now, my girlfriend of less than 6 months is asking me how much she's going to get. I told her she's not, I have already earmarked this money to set up my future, and she's pretty pissed off, saying that she thought we were a couple, and what's mine is hers etc.

Is she being unreasonable?

I had actually planned on using some of the money to take us both away on a surprise trip, but now that she's pulling this crap, I don't really want to.
Why does my girlfriend think she's entitled to some of my inheritance?
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