<human>: Condense the text into a few key points

I [31M] just got a raise at work, which after taxes and other deductions is going to net me about $800 a month in take-home cash. I have been living with my girlfriend [28F] for about 8 months [we've been dating for 15 months total] and we split our bills right down the middle, 50/50. We have never discussed money in terms of what we actually make, like hard dollar amounts, but I have a feeling that I make more, especially now with this recent raise. I've been thinking about telling her that she can reduce her contribution to our monthly bills so we can both have some extra spending cash instead of just me. What are your thoughts? Is this something I'm expected to do? If so, how much should I reduce her contribution by?
<bot>: Got a raise and live with my girlfriend for 8 months. We split bills 50/50 now, but should I reduce her contribution since I have more income now?