Most Helpful Guy
Emotions can be controlled, so if one noticed that they were starting to slip they could quickly nullify the feeling by, for example, thinking about the person and sort of summoning up the feeling of "I do not trust this person!" It's sort of a psychological anchoring effect. Since love and trust are highly related you can stop it there. An ounce of prevention is worth a pound of cure.
Most Helpful Girl
Yes, way too many times, I always seem to fall for the wrong guy