My BF has been living with me for about 6 months. A friend of mine keeps telling me that the bible says its wrong to live together and that we need to get married. i keep looking but I cant find anything that says its wrong.
It's called fornication, and it is any sex outside of marriage.
Mat 15:19-20a says: For out of the heart come evil thoughts, murders, adulteries, fornications, thefts, false witness, slanders. These are the things which defile the man...
Heb 13:4 says: Marriage is to be held in honor among all, and the marriage bed is to be undefiled; for fornicators and adulterers God will judge.
If that is not enough, he says in 1Cor 6:9-11: Do you not know that the unrighteous will not inherit the kingdom of God? Do not be deceived; neither fornicators, nor idolaters, nor adulterers, nor effeminate, nor homosexuals, nor thieves, nor the covetous, nor drunkards, nor revilers, nor swindlers, will inherit the kingdom of God. Such were some of you; but you were washed, but you were sanctified, but you were justified in the name of the Lord Jesus Christ and in the Spirit of our God.
Two things spring forth from this scripture.
1) People practicing these sins will not see heaven.
2) Many leave those lifestyles behind, get saved, attain mercy and forgiveness from God, and start a wonderful walk with the Lord with the promise of spending eternity with Him.
You might also take interest in reading Jesus' conversation with the woman at the well in John 4:1-42, focusing especially on verses 16-18.
I'll pray that you do the right thing.