Warning! Spoilers ahead for Young Sheldon season 5.
Pastor Jeff is the one who destroys George and Mary's marriage in Young Sheldon, not Pastor Rob. The Cooper parents' marriage has been in a gradual downward spiral for a while now due to the pair's inherent differences. Now, it may be taking a turn for the worse, but while Pastor Rob is easy to blame for Mary and George's Young Sheldon problems, Pastor Rob is actually more responsible for their issues.
Currently, The Big Bang Theory spinoff is focused on Georgie (Montana Jordan) after he and his girlfriend, Mandy (Emily Osment), became pregnant. This big development has impacted all members of the Cooper family, including George Sr. (Lance Barber) and Mary (Zoe Perry). Aside from them arguing about how to proceed with the situation, the crisis has also forced the couple to re-examine their relationship. It's a particularly tricky subject because their marriage started because of an unexpected pregnancy as well.
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Other people's unsolicited opinions have made things harder for the Coopers. Mary's reliance on Pastor Rob (Dan Byrd) has been particularly frustrating for George. That being said, while it's easy to pin this on Rob, the blame for destroying the couple's marriage should be put on Pastor Jeff (Matt Hobby). In the Young Sheldon season 5 penultimate episode, Pastor Jeff decided to fire Mary from her job at the church to keep the congregation from talking about her and her family. He made it seem like he was doing it for the betterment of the Coopers, but in reality, he just didn't want to draw the ire of his community for his ties to Mary. For years, Mary sucked up to Pastor Jeff,
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