My couisn showed me his intimate body parts I feel really uncomfortable

So my cousin who I recently started speaking to and didn’t know of kept showing me his abs and his boxers telling me about girls he has slept with is this normal behaviour where second cousins and he’s never really knew me does he fancy me or something he asked me if I was single and when i was on the phone to my friend says who’s she I said how do u know it’s a she he said I thought u didnt speak to boys also he kept staring at me teasing me play fighting with me I spoke to my aunt and his brother who swore they wouldent say nothing but I feel like ivemade the situation more awkward they said that’s normal behaviour for him and he shows of to his freinds and shows them his abs to but I feel like they may be just trying to make it seem normal when it isn’t I thought he may fancy me but they says it’s normal and I think it’s weird have I over reacted would you think he fancied you to if he displayed that behaviour the whole situation is to weird to me they said he’s always been the confident type but I feel out of place have I took this to far he’s my But how can anyone act that way and it be normal they sed he shows of to his freinds and stuff but I’m his fuking cousin I feel so awkward now like I don’t wanna see any of them do I have a right to feel this awkward would you after his behaviour would u presumed he liked u or did I over react I feel crazy now