My partner and I have lived together for about a year. Neither of us want to get married, just bad family experiences there on both sides. We have always split expenses based on income. I make about twice what she makes before taxes so we split everything 60/40 (I get taxed a lot higher). A couple months ago her uncle who didn't have kids passed away and she unexpectedly got a few hundred thousand in cash +stocks. She had no idea this was coming and had only met him a few times in her life.
We split rent and all household items by income and have been talking before all of this about upgrading our furniture, mainly buying a king sized bed and new sectional. Before all this I would have expected to keep the current split of me paying the majority, its what we did for other common purchases. But since she just got this huge cash infusion I suggested we take that into consideration and at the very least make it 50/50. My partner got really mad about this and said I was being an AH trying to capitalize on her family's death and saying inheritance shouldn't ever be a factor. I wasn't asking for a percentage of her inheritance I just thought it should be part of the equation in how we split things that benefit both of us. Was I being an AH there?
For clarity, She makes about 65k a year in base salary with some sporadic bonuses. My salary is a set 120k. She inherited about $270k in cash and about 140k in stock. The expenses we have coming up that I was referring to will be around 2-3.5k depending on how nice of a bed/sectional we get.