Most Helpful Girl
Maybe because they promise without thinking, and then later on realize they don't want to keep the promise they did or something...
Most Helpful Guy
Not everyone has selfless motives
Some people don't mind breaking promises, some people are gold diggers, some people are easily seduced, some people are easily brainwashed
That is why I advice people to not become blind in love and examine their partner for crucial faults else they're the one to blame for choosing the wrong partner