Girlfriend / Boyfriend

Partners in committed non-marital relationships are also sometimes described as a significant other or partner, [3] especially if the individuals are cohabiting.

Boyfriend and partner mean different things to different people; the distinctions between the terms are subjective. How the term is used will ultimately be determined by personal preference.[4]

A 2005 study of 115 people ages 21 to 35 who were either living with or had lived with a romantic partner notes that the lack of proper terms often leads to awkward situations, such as someone upset over not being introduced in social situations to avoid the question.[5]

There is a significant difference between girlfriend and boyfriend, and girl friend and boy friend. In a strictly grammatical sense, a girlfriend[6] or boyfriend[7] is an 'individual of significance' with whom one shares a relationship.

Here