Most Helpful Girl
It just means making your loved one feel special and reminding him/her you still love and appreciate them.
For example, I live with my best friend, and sometimes I pick up her favorite candy at the store just because. That's romance to me.
Most Helpful Guy
Being attentive, putting your partners happiness over yours, because basically, her happiness makes you happy. Noticing the small details, making them feel appreciated, knowing that you care for them, and trying your best to give them as much as you can.