My roommate thinks I should give up the living room whenever her boyfriend is over

Okay so I (18F) live with my roommate (19F) and we usually get along fine. But lately, her boyfriend (23M) has been over ALL the time. Like, he’s basically just living here now, except he doesn’t pay rent.

So last night, I get home from work, grab some food, and plop down on the couch to eat and watch Netflix. Five minutes later, my roommate and her boyfriend walk in, and I can tell he’s already annoyed. He looks at me and goes, “I thought we were gonna have some alone time?”

She sighs and says, “Hey, do you mind giving us the living room for a bit?” And I just said, “Uh… I live here?” Like, this is MY apartment too. She kinda rolls her eyes and says, “You could just go chill in your room for a bit.”

Like… excuse me?? I pay rent here too. Why should I go hide in my room just because he wants to sit on my couch? I didn’t move, and they ended up going to her room, but later she texts me saying I was “being inconsiderate” and that I should’ve “respected their space.”

Am I being crazy? How is it THEIR space? We share this apartment! If anything, he’s the guest, not me.