The people of Judah have broken their promises. They have done something God hates in Israel and Jerusalem: The people of Judah did not respect the Temple that the Lord loves, and the men of Judah married women who worship foreign gods.
Whoever does this might bring offerings to the Lord All-Powerful, but the Lord will still cut that person off from the community of Israel.
This is another thing you do. You cover the Lord's altar with your tears. You cry and moan, because he does not accept your offerings and is not pleased with what you bring.
You ask, "Why?" It is because the Lord sees how you treated the wife you married when you were young. You broke your promise to her, even though she was your partner and you had an agreement with her.
God made husbands and wives to become one body and one spirit for his purpose -- so they would have children who are true to God. So be careful, and do not break your promise to the wife you married when you were young.
The Lord God of Israel says, "I hate divorce. And I hate people who do cruel things as easily as they put on clothes," says the Lord All-Powerful. So be careful. And do not break your trust.
You have tired the Lord with your words. You ask, "How have we tired him?" You did it by saying, "The Lord thinks anyone who does evil is good, and he is pleased with them." Or you asked, "Where is the God who is fair?"