The main character always faints when her love interest flirts wit her.
Either that or she gets all giggly and swoony.

Like,
Are you drunk?
Are you ok?
Do u need me to call the ambulance?

The same thing happens with other girls too.
Like, a guy winks at a group of girls and they all faint.

Are u ok?
I think there's some sort of genetic virus going around to these girls...
Fangirl-itis.
It's highly contagious.