You and Derrick have been dating for over a year and you decide to move in together

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After living together for some time, you notice something has changed in Derrick, starting with his mood swings. Before he leaves for work, he is very sweet and gentle to you, but when he comes home from work at night, his attitude changes drastically and he becomes rude and unlike the Derrick you know. However, you just assume that Derrick's change in attitude is because he is tired after a long day at work. But there's something you don't know about Derrick's sudden change of attitude.

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If there is any mistake please let me know, I will try to fix it.