I'm pretty sure that you already know the answer. The bible (God's Word) is clear about fornication, sex before marriage is wrong and harmful. You must know from experience how harmful sex before marriage is. To name a few, std's, grieving the Holly Spirit, you become one with that person, it opens the door for anything that person is into to come into your life. I could go on about the harm of this sin. You should be thankful for this friend being strong enough to tell you the truth that you didn't want to hear. God bless, no condemnation here but wanting you to please the Lord in all you do.