
Well there is a nice way to go about it. Tell him. But don’t be rude about it. He could be going through depression or something. Sometimes that makes you not want to shower, bed rot, or etc. you can tell him, just don’t be rude about it. Let him know you’re worried about him, and let him know that maybe you can’t handle the smell anymore. Just be polite about it and ask him to please take a shower. Communication is key man
i would honestly argue there isnt a nice way to have this conversation. its going to be hard and awkward for both parties, especially if he's neglecting his hygiene because of mental health issues, which he likely is because no one wants to willingly be dirty. being gentle and approaching from a place of concern is the best option but there's really no good way. it sucks for both of you.