As this world turns away from God, our morals and virtues go down the drain. Trust, integrity, and honesty are at the heart of what God wants from us.
Most young people don't believe in God. They really don't care about other people and want to please themselves. If this means lying, cheating, and getting what they want, then they will break all trust in a relationship.
Everyone has a "god" or an idol. If it's not the true God and Savior Jesus Christ, then it's usually some distorted useless god that does nothing, or it's their own self. I have noticed that among atheists, they idolize themselves and their "intelligence." Every human is born with the need to worship and if they don't believe in God, guess what? They usually end up worshiping themselves. This is why they don't care about other people, they don't want to sacrifice for any relationship and they end up breaking trust with cheating, lying, and other sins.
I know that not all young people are like this but I would say about 80% of them are. And I started talking about younger generations because you were talking about your kids. Just saying this because I don't want a young person getting mad at me for saying it lol. I'm fairly young myself so I know what I'm talking about b/c I see it everyday.
I sure do hope this trend changes though and I pray your son and daughter find good spouses.