My boyfriend told me a girl grinded on him and he did nothing about it, is that considered cheating?

Loving__tiger
So my boyfriend was on a trip and this particular event hosted a dance on the last day so he said he was gonna go and I'm like "okay cool". Well he starts to tell me how some girl comes up to him unbuttons his shirt and sticks $20 in his shirt and starts grinding on him, but what gets me is that he didn't stop her or anything instead he puts his hands on her and starts dancing along. Is this considered cheating? Or am I overreacting because it feels awful
My boyfriend told me a girl grinded on him and he did nothing about it, is that considered cheating?
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