comments:
It seems like you have plenty of answers here, so I'll just drop a quick agreement that proportional makes sense as long as you both agree to an place that feels comfortably within both person's means. I also wanted to suggest reading a book https://www.amazon.com/Tightwads-Spendthrifts-Navigating-Minefield-Relationships/dp/1250280079, as it addresses what might continue to be struggle for you as you continue to build a life together. This is based on the "Tightwad-Spendthrift Scale." Don't take offense at the names, they aren't judgemental. As financial incompatibility is one of the primary reasons for divorce, it would be a good idea to start working together to understand your differences and work toward ways to discuss money and its place within your relationship. It sounds like you are somewhere closer to the tightwad end of the scale and she is possibly more toward the spendthrift.