Most relationships go through a “gray” trial period where both partners are unsure if they're on the same page with feelings and the status of the relationship.
Some prefer to stay monogamous from the start, while others like to keep their options open, just as some view sex as something to be saved until the blossoming of a full-on relationship, while others need it early on to determine levels of chemistry and attraction.
The key is to be honest in your intentions without being bossy about the behaviour you expect from the man or woman you’re seeing.
Casual dating is a marvelous way of getting to know all kinds of people, without having to feel tied down to anyone until you’re absolutely ready. That being said, it is important to remember that your dynamic with anyone, regardless of who it is, won’t be as intense or committed as in a serious relationship.
Serious relationships tend to be monogamous and long-term—or at least conducted with that intention in mind.
Given the modern approach and all, we discover whether we are their girlfriends or not when they are introducing us to their friends. The best way to approach the situation is to be straight forward. Do you really like the guy or are you more 'lets see where it takes us'?