“Out of the corner of her eye she thought she saw Jace shoot her a look of white rage - but when she glanced at him, he looked as he always did: easy, confident, slightly bored.
"In future, Clarissa," he said, "it might be wise to mention that you already have a man in your bed, to avoid such tedious situations."
"You invited him into bed?
" Simon demanded, looking shaken.
"Ridiculous, isn't it?" said Jace. "We would never have all fit."
"I didn't invite him into bed," Clary snapped. "We were just kissing."
"Just kissing?" Jace's tone mocked her with its false hurt. "How swiftly you dismiss our love.”
City of Bones