Is it true you don’t fully know your partner until you live with them?

Im in denial that this is my boyfriend. We have been together for 5 years and we just moved in 2 months ago.

He was so loving, affectionate, thoughtful…. Etc etc he was perfect.

Im living with him and I don’t even know him anymore. He’s always annoyed. Always on his phone and doesn’t even care if I’m there. So the other day, I didn’t cook. Sundays I don’t cook. He wanted to try this place that didn’t open until 3pm. He woke up so irritated. We took my car cause my AC works really good. I didn’t feel like driving so I suggested a closer place. I found one I had been wanting to try. He got so mad and started cursing at me and screaming. I drove back and took a nap

So when I woke up he said sorry and cooked me dinner.

Yesterday, he woke up super early like 5am. He was throwing a tantrum cause it was hot. It was bad. So he went to sleep at the living room🥴 wtf!!!

Today, he’s been so mad for no reason. He told me “our relationship is shit” he said it because I took forever showering. I was shaving and blow drying my hair. I apologized.

He slammed the door when he took off to work.

I really don’t understand who he is now. Makes me sad