Sabrina was worried Roman might hate her after everything, and therefore was giving him space, at least that's what she told herself to justify why she was actively going out of her way to stay out of his orbit. As far as he was concerned, he could take his sweet time sorting out his feelings, since she had to do the same. And that meant recognizing that things with Harvey and Nick might not really have been love, at least not if Sabrina was taking recent experiences to heart.
If she was being honest, she wasn't exactly having an easy time of things. Accepting that the 'love' she felt towards Roman was artificial was damn near impossible, especially because of how potent the emotions were. Thinking about it as objectively as possible, she came to the conclusion that when it came to Harvey and Nick, that was all just puppy love. Whereas with Roman, she got a taste of what actual full blown adult-type serious love, and like it or not that left a mark.
She heard the bell to her room, cautiously opening the door a little. "Beer, eh?" she asked, moving aside to let him in. Leaning against her door for a moment as she let him get comfortable, she debated seeing what he had to say first. It would be the polite thing to do. "What's the occasion?"