Premarital Christianity?

I have a friend who has always been a strong devout Christian. She knows when I was younger I lost my virginity and felt a ton of guilt about it. I ended up marrying the guy, but regardless it was wrong to have before marriage. And I knew that, I felt guilty and sinful, I eventually forgave myself for my mistake and God forgave me. I've recently found out my friend is ually active, but feels it's okay with God because her and her boyfriend have prayed about it and feel they are doing it out of love, and they believe it is society's rule to be married and have a stupid piece of paper saying your married before having . She feels no remorse. She says she feels no guilt so it can't be wrong. I don't know if she is lying trying to fool herself or if she really feels no remorse.It hurts me she says she prayed to God about having before marriage, and feels its okay with him, so her conscience is scott free. I new my sin, it bugs me she is trying to justify what she is doing.