Yeah. Show up at the party, maybe an hour or two after it has started. Be casual. Don't worry about not dressing up. There is zero chance that everyone else at the party will have, there will always be a bunch of other people that don't. Show up, check the place out, say hi, check if her boyfriend is there or not. If he is just hang out a while and leave. Don't get too worked up about it or over analyse it, just enjoy yrself man.
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