I would say take it as a "could be true, could be a dick, but should probably see if i can improve my scent any". I dont know you, so i dont know if you smell. But if one person says you do and they're honest, other people probably think that, and youd be suprised by the amount of things people in your life will hide from you because "its not that bad". Also, everyone smells different to everyone. So it very well could be that he thinks you smell bad, but everyone else thinks you smell good. With this being said, the best approach is to do your best to smell good (this could mean just do what you normally do) and not worry about it. If you're trying, you can only smell better right?