Is it ok for a boyfriend to have a LOT of female friends

My boyfriend calls this one girl that is his friend "boo." 
He sleeps over her house. But he swears he sleeps on the couch. 
He's brought her to a nice restaurant before. In his defense it's where he works and he was just picking up tips. But she had whine while he was doing it? 
He goes to parties with these female friends. 
He planned to go to a music festival with three girls. It would be an over night thing. 
Normal?

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