Most Helpful Guy
Depending on how much feelings I have for the girl. Usually I start losing feelings for them if they start sounding uninterested.
Most Helpful Girl
Time and personality.
Time: I might lose feelings over time if nothing is happening between us, we barely talk at all and I'm getting bored of it.
Personality: if I find something out about him that I didn't know before, something that is a deal breaker to me. Like if he's a drug user or criminal, or if he does/says stuff I consider to be rude and disrespectful. Or if he hurts me somehow.