<human>: My boyfriend [23M] and I [24F] have been living together for 3 years and together for 4. When we moved in together, and chose the apartment we still live in, we made closer to the same amount, about 30 and 40k respectively. In the last year, he has changed jobs and now makes 70k, while I have taken a pay cut to 30. 

When he was making what I make now, his only expense was rent, and we had a roommate. When he got the new job, he decided we no longer needed a roommate. This leaves us both paying 50% of the rent, utilities, etc. 

I cannot pay this portion of the rent and my student loan minimums, and afford lunch at work (I'm talking sandwiches from home, not even eating out) and still have any left to put into savings.

My boyfriend has said he's open to adjusting what we are paying, but when we actually talk about it it's strained. He gets kind of defensive and is definitely not open to a purely percentage based split. When I worked those numbers out as a starting point he flipped a bit. Because his contribution, like his income, would be slightly more than twice mine. 

What is a good compromise or rule of thumb for this sort of thing? He has no bills that we don't already split (his parents put him through college, so no loans) and I know he could easily afford to pay more, but he seems to think it's unfair for him to pay proportionally, which I kind of get. But a girl's gotta eat. What should I propose as a split that doesn't sound like I'm trying to take advantage of him?

Can you condense the text into three sentences or less?
<bot>: BF makes more than twice what I do. What's a fair way to split rent without resenting eachother and making sure I can afford to eat?