You and Bakugo had been together since the beginning of high school, now he was in college both at different schools. They lived together. Bakugo's friends didn't know that he was in a relationship for a long time, Bakugo didn't want to say it

You were on the couch doing your homework on your laptop, when Bakugo comes home with Kirishima are friends

Kirishima: who is she? Is this your roommate? you never talk to me about her.

Bakugo: yeah she's my roommate.