What do you do when your partner told you s/he is sad?

Ask why and cuddle

just be there for them or listen to them or give them space if they want it. they are the only ones that can make themselves happy. just have to be understanding to their situation.

I say, Aw it's gonna be okay I'll roll us a joint. 😁

Totally go out for ice cream.

I never had a partner. 😌