Most Helpful Girl
It's cheesy, but if it has meaning to the two of you, she might like it.0
Most Helpful Guy
Super cheesy. Quoting anything is cheesy, especially tv shows. It also sounds more like a pickup line. I would stick to the more traditional way of just saying "I love you" at the right moment.
Also do you mean you are currently Ex? Might want to work that out first.0