The heart of man

Before I decided to have a go at the whole Bible, which I have done before- but it was over 10 years ago, the last time!- I mainly stuck with reading the New Testament and the Prophets like Isaiah. After getting through about 37 chapters of Genesis, I realize why- the old testament seems to show the heart of man- and it isn't very pretty. The New Testament seems more about God's heart.

But the OT has some puzzling entries. Maybe partly due to translation, partly due to it really being a puzzle. But that's what is fun about the OT.

Like Genesis 35:22

21 Israel moved on again and pitched his tent beyond Migdal Eder. 22 While Israel was living in that region, Reuben went in and slept with his father's concubine Bilhah, and Israel heard of it.

And that is the end of that account. But, what happened when Israel heard of it? We are left to imagine on our own.
I am not sure of the timeline as things seem to jump around a lot. Did this happen before or after the brothers sold Joseph?
In Genesis 37, Reuben doesn't seem to have been there when his brothers sold Joseph:

29 When Reuben returned to the cistern and saw that Joseph was not there, he tore his clothes. 30 He went back to his brothers and said, "The boy isn't there! Where can I turn now?"

And he seems to be the only one concerned about what is going on with the situation. Concerned about Joseph. Maybe more concerned about his dad.
Maybe he was off with the concubine WHILE they were selling Joseph. Ha ha.
But it just seems odd that he seems to be the one with the most respect for his father and yet he also disrespects him.

Switching over to Esau's line in Genesis 36. I thought it was interesting how in vs. 10-14 it lists the sons and in vs. 15-18 it lists the chiefs and the lists are pretty close to identical. It reminded me that God sees us as his children, but also as his warriors.