@RickiTarr I feel like perhaps I took this question larger than was intended and for that, I apologize.
When you said relationship - I immediately went into the realm of "intimate" but not necessarily sexually. A close friend, a "ride or die" companion, but not particularly a lover. Obviously it could be - but... yeah.
The advice I would give someone just starting to know someone is being authentic and expect the same. We live in a world of rationalization, justification and daily aggressors. We need to be authentic with each other if we are to be more than casually acquainted.
You shouldn't expected to know their deep dark secrets, but I think it is fair to want to understand someone and desire that level of intimacy with someone close.
RickiTarr