Judah owns up the second time. He was the one who suggested to sell Joseph to the Ishmaelites. He might have seen the grief of his father. He personally has suffered loss of his two sons in between, Er and Onan. He might have regretted taking that choice. But now he has got a second chance. Others kept quiet. But Judah speaks up. He owns up to his father regarding his brother Benjamin. "You may hold me responsible if I don't bring him back to you. Then let me bear the blame forever." Gen 43/9 Similarly he also speaks up before the prime minister of Egypt (who curiously is very inquisitive of their family) - "So please my Lord, let me stay here as a slave instead of the boy and let the boy return with his brothers." Gen 44/33 This is how you learn from your mistakes. Life gives you a second chance, own up for your mistakes and do the right thing the next time. Do not keep doing the wrong things. If the Holy Spirit prompts you, just do it immediately...
Amateur as I am, halfbaked as I am. But i write with a purpose, to point to my master, to show of His love. The love I've seen in His eyes, is not just for me. This bard hence writes so that you would see His love too