Baffling that it's 2019 and so many people still seem to think that a person can't be genuinely suffering with depression unless they're unable to get out of bed, or sitting in a corner rocking back and forward and sobbing quietly.
If the OP's DH is depressed, and he's feeling stressed and anxious about her pressuring him for sex in order to conceive, especially when he's already suffering from poor libido and quite possibly ED, is it any bloody wonder his spidey senses are telling him to run, avoid his DW, and go out enjoying himself in a no pressure setting with his mates?
Contrary to popular MN narrative, it is entirely possible to be in the grip of a crushing depression, AND still feel like doing certain activities, even if they're quite possibly a driving factor in your depression in the first place.
Sure, if he genuinely has any interest in recovering then he needs to go back to his GP, explain that the AntiD's are having a catastrophic effect on his relationship due to the side-effects, and seek an alternative, and yes, he is being irresponsible and unfair to OP by refusing to discuss this, but hello????? Depressed people are irrational and unfair, it's part and parcel of living with Depression. Brow-beating him, calling him all the F's and B's under the sun does nothing to help the situation. He needs to realise the effects of his depression himself, and understand that it's necessary for him to recover. Only time, patience, and encouragement will do that.
Perfectly reasonable for OP to end the relationship under the circumstances, but the number of times there are similar posts on here which result in a slew of 'Depressed..... yeah, sure, lol' replies is sickening. Is it any wonder men are so reluctant to discuss mental health when everything is met with a volley of cynicism.