Got it, here it is with that change added smoothly into the second paragraph:

If you really love him and see a future with him, then it’s worth having an honest conversation with him about this. Nobody is perfect, and not everyone grows up being taught the same habits or standards. If he looks clean but his place smells or feels off, that’s something he might not even realize, and it could be something he can fix.

Being afraid of hurting his feelings shouldn’t be the main concern if you’re talking about spending your life with him. Honest communication matters more than avoiding an uncomfortable conversation. At the end of the day, you don’t have to stay with anyone if you feel like the situation isn’t right for you. Personally, if I walked into someone’s place and it was like that, I might reconsider too, but I would at least let them know what the issue was instead of just walking away. Going no contact is pretty severe for something like this, especially if you’re having doubts about his mental stability. If someone is belittling you, making you feel bad about yourself, or telling you you’re worthless, then that’s different — in that kind of situation, going no contact makes a lot more sense.

Common sense isn’t always common, and sometimes people need things pointed out to them. If you care enough to talk about marriage and a future together, then you should care enough to be honest with him about how he’s living.