What does the Bible say about relationships with other Christians?

Above all, keep loving one another earnestly, since love covers a multitude of sins. The Good News: Love each other honestly and earnestly, even when you hate them most.

Does the Bible tell us to trust others?

Trust in the Lord with all your heart and lean not on your own understanding; in all your ways submit to him, and he will make your paths straight. The Good News: Putting your trust in God is the way forward. But blessed is the one who trusts in the Lord, whose confidence is in him.