Rereading this op..this is very cring. Perhaps individual therapy would be beneficial for you...because this seems like you are lacking self esteem, self worth, self respect, and sufficient love for yourself that lead you to make this choice seemingly out of desperation.
(Unless you aren't hygienic as well and picked a similar partnet)
In all these years, you feel like you can't do any better, that you have to settle for an unhygienic man that you feel you have to "mother" about his hygiene??
If he's not bathing properly, he's possibly not washing hands, nor changing clothes frequently (possibly wearing unclean garments) ..which means he is handling food and other things etc...
..and you've been physically intimate, (hugging, kissing, cuddling, sex, being in his presence) etc...smelling him, where you reside must respectfully smell foul.
If you are having problems managing your hygiene as well, perhaps speaking to someone as a doctor or therapist would help.. if you're too embarrassed to do so..many websites and videos can help.