it really depends on how you maintain your lifestyle. 7k for a expat couple in SG may be over-stretching your own wallet at the end of every month.

If you are willing to conform to the living standards / preferences of the rest of 70% singaporeans, that is to eat out at hawker centres, getting your household supplies from local supermarts, etc then life shouldn't be that difficult. You'll still get to indulge in fancy stuffs and/or go for holidays once a while.

Some of the expats i know found it rough to adjust their diet to our local food. They prefer to skip hawkers and go for something more hipster-ish, getting their household supplies from specialty stores and etc.

Better talk to your partner first.