My husband says it burns badly after he ejaculates, buy never when he urinated, he says he has been faithful and so have i, so if we have both been faithful to each other and stds are out, what could be going on? it's been going on for a couple weeks?

Burning pain in the male urinary tract rarely is caused by STD, if there is no discharge from the penis, so probably he is truthful about not having other partners. An infection other than STD is possible, like a standard UTI (bladder infection), prostatitis, or seminal vesciulitis (semen collecting sacs). He should see a doctor soon for exam and testing, ideally a urologist. Good luck.

He could have non-VD inflammation of the prostate . Have him get checked by a Urologist.