You are right to be uneasy about your friend’s approach. It is not a good practice for anyone to say the Lord has spoken to him or her about another person’s life. Such an approach can be presumptuous and often lacks the foundation of a relationship context necessary for someone to receive such advice. Obviously, there are times when we should be corrected by good friends, especially if our lives are not in order. But even that should be done carefully and compassionately on the basis of scriptural truth, not on the claim to a personal message from God.
This kind of approach—to declare that the Lord has given specific advice for someone else—has the danger of spiritual abuse and manipulation. Furthermore, to liberally say the Lord is directing too many specific details of life is to treat Him like a GPS, when we already have and know the map that provides foundational biblical principles for conducting our lives. And these biblical principles also give us good common sense.