So he overworked himself despite your protests, didn't speak to you about plans he was making for both of you, didn't entertain the thought of consulting you when you tried to speak to him about any of this, and now you're going to blame yourself for his death when you weren't really pushing him to do any of that? Now that you're here, rather than informing this girl of his passing and of your identity, grieving together and moving on in his memory, you're going to pretend to be him to alleviate your misguided guilt?
Wow.