Love is a serious emotion and it should not be taken lightly. People can have severe emotional distress if they deceive themselves into believing they are in love and the relationship turns sour. People should be careful when they are in romantic relationships so that they do not get hurt.
Falling in love quickly can work out great for some, in many other cases it ends up with a ugly breakup at the end because two people went further than they ever really should have. It's a big gamble but as it does work out sometimes you can't really tell somebody they're wrong for taking the risk.