Unfortunately then I have some bad news. As an unmarried couple you do not have any rights any property or money that is in his sole name. You would have rights to property that you acquired or to any bank accounts that are in both names. However, being a "girlfriend" does not afford you any legal rights in PA.
I was asking the question earlier to try and see if you could make a claim that you where common law married. However, without vows prior to 2005 that is not an option.
If he is mentally competent enough to grant a power of attorney
then he can possibly consent to give you some property by written agreement. The legal standard to execute a power of attorney and a legal agreement are the same. However, this would be something that would be voluntary from him and does require him to be legally competent.
I cannot provide you with specific legal advise. I can provide you with general information about the law related to your question. My answer, and any information that you can find online, should not take the place of having a detailed consultation with a lawyer in your area to advise you regarding your specific issues.
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