WTF joel???

I just finished watching the episode where joel moves out of the house. That was soo frustrating to watch. Who does that??? He decided to go for divorce because a guy kissed his wife. I get that Julia was cheating on him emotionally but he gave up too quickly. She was also nagging a little but he literally saw her having an anxiety attack last season, she was asking for help and he didn't provide much of it. Also he was acting like he was the only man in the world who works. He disrupted his entire family- 2 kids one of which they recently adopted. Also this whole arc is so out of character for him. The writers did him dirty for cheap drama.