I love both styles- If it were me, I would keep it mainly minimal ( Scandi) and incorporate beautiful stand out Singapore pieces to give it more character! Good luck!

I would say mix the two and you'll get a beautiful eclectic room with lots of personality. OR if that's not an option, maybe have themed rooms and split your apartment evenly. Good luck! Keep us posted with photos if you can :)

Stick to lighter wood tones with your singapore choices, if you can, that way any softer and beech or oak Scandi elements should fit right in.

For your Singaporean style, if you choose from within the more minimal colour palettes e.g. blacks, whites, greys, light wood it would also fit right in with your boyfriend's Scandinavian theme. It would be a good marriage of tastes that will come out very tasteful!

you can mainly go for Scandinavian and the touch of Singapore can be through arts, accent pieces...say cushions with peranakan tiles, etc.. It also depends on how big your space is. Scandinavian style tends to work well on small to medium sized space as it is clean and uncluttered. the Singapore style or oriental style can be pretty "heavy " when the proportion and composition are not balance.