Most Helpful Guy
For everybody it's diffetent. For me to loose feelings for a girl would be over time because I don't quit on a girl even if things are going bad.
Most Helpful Girl
If you have been with someone a very long time, no contact is the way to go, @Cerate. It might take longer because your heart is stronger, but sometimes, out of sight is just what you Might... Need to make it all go away.
However, if it is someone you don't know well, have known for a short time, then easy to put them out of your mind.
Good luck. xx