@Rgrdlaw,
Sorry you are suffering this way. You deserve to have what you want in a relationship. It isn't just about the lack of sex or intimacy. It's also about trust and openness of communication 'cause you're not getting that either. He's not THAT great a guy, if he's rejecting you like this, is he?
A single mom who lived at home has some major roadblocks when involved in an intimate relationship. Unless you can go to the b/f residence, it can problematic. Perhaps that parent's residence issue worked out eventually?
Another man,,,the right one..who appreciates you more...may respond differently. his tiredness for his long work hours has dragged on but it can't be an excuse to continue on not to have sex. If there's no communication about how to resolve this, you're in an impasse.
Good luck but..perhaps putting an end to this could be in your best interests. Of course, you should try to discuss your needs with him directly and plainly and let him know the seriousness...and that you mean business..about ending it...not idle threats.