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am I allowed to be mad?

so I've been talking to this guy and we've been on a few dates now and things have been going well. he was meant to be coming round mine tomorrow night to watch movies and meet my parents. he also said that he'd told his parents about me. yet he's just admitted that last night he went to a house party and slept with someone else. we've never said we were exclusive I just assumed but I'm so mad and I don't want him to meet my parents anymore. he says I'm making a big deal as we're not in a relationship and never said we were exclusive?!