She says they didn't sleep together but he says they did. WTAF?

he sent me a picture of his naked leg and hers in a bed on a trip with college. I asked him if they cheated and he said I didn't want it to happen like this but yes, we slept together. I asked her and she freaked out and was like I never went near him like that.
Believe him, my boyfriend of 2 weeks and best friend of 3 years
Vote A
Believe her, my friend of 7 years
Vote B
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GirlGuy
She says they didn't sleep together but he says they did. WTAF?
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