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I agree it wouldn’t be right for her to pay off your mortgage. But I think either 50/50 or proportionate to income (i.e. 1.3/1) splitting of bills, groceries, and other costs incurred by the both of you, is reasonable. But you’re in relationship, not a contract, so do discuss this with her and see what the both of you would prefer.
Tbh, a pet that’s friendly and tameable like a dog but physically a wolf would be cool. I think wolves are very cute.