He needs comfort from his boyfriend...

Izuku, your boyfriend, was having a bad time with himself and society... Well, luckily, civilians FINALLY accepted him being a hero, it didn't mean he accepted himself.

Izuku was in his dorm, he invited you over, he thought you'd come a bit later... That's why he was still crying and he didn't want you to see it.

You had keys out of his dorm.