Want to buy house but dont want to lose it!

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Hey everyone, I have a sort of odd question. I recently inherited money and want to buy my first home. My girl freind/fiance lives with me and it would only stand to reason that she would expect to change that title. Without going into details that make no difference in the calculation. How can I buy a house without worrying about her getting it (or any of it) if we broke up in a few years? Is it as simple as just not marrying her? I would like to marry her but dont know if I'd bet my house we'd stay together.

I know this sounds cold and calculating, but when you hear stuff like "if we break up I wont get anything". In my opinon love and compassion (the same she has given me) is fair.

Thanks for reading my post.