My boyfriend went to a staff party and he didn't even let me know his leaving and had his phone off until 6am in the morning?

He comes back hungover and shows me all the videos and pictures he took and he said his co-workers flirted with him but he didn't flirt back and then he has this picture with one of the women and another video of the same women dancing up on another women looking straight at him being flirty, he says it's nothing, thoughts?
My boyfriend went to a staff party and he didn't even let me know his leaving and had his phone off until 6am in the morning?
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