Generally speaking, "dating" describes a less serious level of commitment before either person is ready to describe the other as a girlfriend or boyfriend.
This is not a firm rule because the terms have no strict definition.
The instability of relationships comes from the opaqueness of feelings.
In one of their studies, they found the keys to understanding your relationship development–there are three distinct relationship stages and this is what each stage looks like.
What is it: Casual dating is the first stage of any relationship.
That's usually the problem with rushed relationships.
People like to think that just because they know someone and love someone that their relationship can last the way a true partnership will. They are for couples who have waded their way through all the bullsh*t and landed on something stronger than just a relationship.