My husbands dick has been smelling pretty bad !?

This is a weird post I just wanna hear your thoughts. A few months back my husband was having an odd dick smell I wouldn't know how to describe it, it just smelled gross! And when we had Sex my vagina would smell like it too ! I wouldn't say anything, but it's now back !? 
And I did finally say something today . He said his been drinking a lot of Red Bull and i asked him why if he had stopped and his answer was:  
What are your thoughts ? Would you think anything bad like cheating ? I have crazy trust issues every relationship ever been in I've been cheated on so ... I know I'm probably crazy for thinking cheating out of this? Or am I not ? Thoughts ? He showers daily, isn't circumcised, is very clean with himself