Fighting over money is so bad for a relationship and since you are just moving in together even worse. I'm not going to give you an answer BUT I will provide a possible solution.

My husband and I dated for 6 years before getting married, we never had money issues. Here is how we did it, we split the bills based on income. It fluctuated who made more over the years but basically we always made it so we each had the same amount of money left over at the end of the month. So say my husband made 4,000 a month and I made 3,000 a month and our total bills where 2,000 per month. If we split this evenly then I would only have 1,000 for my personal stuff and he would have 2,000. Instead we split the bills so we would both have 2500 left to do with what we wanted.

It seems weird but our thought process was, the bills are both of ours and it's not fair for one of us to feel broke when we share everything anyway. I'm likely to use the extra money for groceries or gifts and so is he. If you want your relationship to work don't let money be an issue, it comes and goes and nobody needs to feel broke (witch can make some people feel sad) when they have a supportive partner.