It sounds like your boss is jealous of your relationship with D. Simple as that. And I'd say you are being isolated and picked on. And the fact that the higher boss just smirked at you and didn't do anything to help the situation really sucks. Does your work have any regulations about on the job dating? Is there someone else you can put in a complaint into? If you can't find any relief here I would start looking for a new job. I just left a job where my boss would hit on every girl and It was so unprofessional and just wrong. I was also picked on by the women who had more seniority and every day was miserable!

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