Why is everything colorful with him? (Armin x Reader)

Why?

Authors note:
I know everyone hates these but oh well. I just need to clear the air (y/n) is your name, (l/n) is last name (p/n) is pets name and I will put more notes in as we need them. Enjoy my crappy writing!

Your point of view
"Hey (y/n)!" Armin says with a great big smile on his face "I have someone important for you to meet Saturday". Your confused but mostly shocked.
"Armin Arlert, is excited for something" you say with excitement in your voice.
"It's important to me" Armin said. He look at you with the one face you hated. The one that looks like he is going to cry unless you agree with him to do whatever he asks.
"Ok, I will be there. I will meet up with you in the courtyard." You said, and also let out a sigh.
"WHOOOHOOOO" Armin screams out of excitement. He also starts running around the house. You laugh, and make a not about how cute his laugh is. Once you can get him to stop yell and running you convince him to listen to Hamilton and Be More Chill with you and you guys talk and sing until you fall asleep.
"ARMIN" you yell, panicking and run thing to do your eyeliner, get dressed and get him up. "I SWEAR I WILL SLAP YOU IF I COME IN THERE AND YOUR NOT UP" as your rushing to get ready your very confused on why he is sleeping in, let alone let you sleep in. He is such a good student and has never been late or missed a day.
You end up walking out there and him not being up. So you follow up with what you promised to do. You slapped him. He woke up and cured his cheek in pain.
"WHY DID YOU DO THAT!" He mad but your also able to tell that he is upset.
"Your going to be late." You say calmly as you toss him clothes. "Be in the car in 5 min or get an Uber." You walk out the house slamming the door on your way out. Armin barely makes it outside and he jumps in.
"Why did you sleep in!?" You almost yell, but manage to keep calm and not.
"I am sorry." He says as he rushes to organize himself.
"Tell me." You say in a stern voice. Armin doesn't talk at first so you shoot him a deadly glare.
"Fine!" He says with fear in his voice. "I was texting someone after you feel asleep"
"WHO?" You finally cave into your anger.
"MY GIRLFRIEND" He says looking at you scared.