Jonah became very angry and is upset about LORD choosing to not destroy Nineveh.
He knew LORD too well, and here is what he told the LORD, “Isn’t this what I said, LORD, when I was still at home? That is what I tried to forestall by fleeing to Tarshish. I knew that You are a gracious and compassionate God, slow to anger and abounding in love, a God who relents from sending calamity. Now, LORD, take away my life, for it is better for me to die than to live.”
LORD asked if he was right to be angry.
Jonah then left the city and sat in the hot sun where God causes a plant to grow to provide shade for Jonah. The next day LORD send a worm to kill the plant. Jonah then said it would be better for him to die. LORD questioned Jonah’s anger about the death of the plant, and asked him why he thought a plant should be spared from destruction but a large city like Nineveh should not.
Just like how we know our best friend intimately, Jonah knew LORD very intimately - gracious, compassionate, slow to anger, and abounding in love.
If I ever thirst to taste pure and true love, I should look towards the LORD. One sip of His love makes me want more and more.
LORD sent Jonah to the city so that people would repent, and turn away from their sins - and they did. This made LORD happy.
When we repent, move away from sin, and shift our focus towards the LORD, He loves it.