Most Helpful Guy
I think there's psychological studies or tests that have said that if you have a crush on someone for longer than 4 months, you're in love with them.1
Most Helpful Girl
1. When you think you cannot live without them.
2. When you no longer see them as perfect, but you recognize their flaws and still consider them beautiful and unique, even though the harsh reality is that they are the same crap as anyone else.1