1. There is nothing wrong for a Muslim to make “friendship” with the opposite sex (boyfriend and girlfriend)
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2. Islam on general relations between men & women:
Muslims should have good relations with all people, males as well as females, at school, at work, in your neighborhood etc. You should be kind and courteous to everyone. Allah says in Surah Tawbah: Verse 71
The believing men and believing women are allies of one another. They enjoin what is right and forbid what is wrong and establish prayer and give zakah and obey Allah and His Messenger. Those - Allah will have mercy upon them. Indeed, Allah is Exalted in Might and Wise.

3. However, it is not allowed in Islam to take a non-mahram person or persons of the opposite gender as a very close friend. Such friendship often leads to haram:
Allaah says (interpretation of the meaning):
“Made lawful to you this day are al-tayyibaat [all kinds of halaal (lawful) foods…]. The food of the People of the Scripture (Jews and Christians) is lawful to you and yours is lawful to them. (Lawful to you in marriage) are chaste women from the believers and chaste women from those who were given the Scripture (Jews and Christians) before your time, when you have given their due mahr (bridal money given by the husband to the wife at the time of marriage), desiring chastity (i.e., taking them in legal wedlock), not committing illegal sexual intercourse, nor taking them as girlfriends. And whosoever disbelieves in the Oneness of Allaah and in all the other Articles of Faith, the fruitless is his work, and in the Hereafter he will be among the losers.” [al-Maa’idah 5:5]

4. In the Qur’an, Allah mentioned that good men and women are those who marry, do not have fornicating relationships and do not have "darlings" or “sweethearts” (meaning boyfriends or girlfriends (Akhdan see Quran, Surah An-Nisaa’: 25, and Surah Al-Ma'idah: 5).
Akhdan are "sweethearts" or for a man a "girlfriend" and for a woman a "boyfriend".
The Prophet, peace and blessings be upom him, is reported to have stated that “whenever two strangers of the opposite gender are alone with each other, Satan becomes the third one between them.” (At-Tirmidhi)”

5. Girl friend, boyfriend – nouman ali khan
Girl/boy relationship Baba Ali