Muscular was not the best boyfriend a person could have. It's always loud, pressuring, fusterating etc.

Info about his past.

You understand why he's that way. Because he never really had a relationship with his parents at all. Unlike his little brother... his parents Tardaharu Imasuji(Father) and Sumiko Imasuji(Mother) did support him but he was neglected because they saw his little brother, Katsurou Imasuji, something far more better and greater than him. So Muscular is misunderstood by people because they don't know why he's the way he is. He had killed Katsurou when his quirk first appeared because he got mad and lashed put pushing his own brother which musculars quirk had activated and hurt Katsurou badly which killed him and he was 2 Years younger than him. When he was a kid they pretended it was a treasure hunt with them, but instead they tried drowning him. But he had injuries them by knocking them back. And had damage to his lungs when he was younger so now hes always afriad of water now.

But now, he's a blood thirsty psychopath because of what happened. Because he wants to fight all the time now. It scares you half to death because you don't want him getting himself hurt or even worse dead. The guy may be rough but you have mental issues that he's not aware of. You have mental issues and always miss him because he's your boyfriend, and at this point your all he has left now because now his parents are presumed dead.

You were in you room on your phone, he walked in, grabbed a shirt, and sweat pants, and went to the bathroom, you heard the water running, and assumed he was taking a shower. When he was done he came out with wet hair and new clothes, then walked out the room not really saying anything to you.