VP - I spoke to DP about this last night, asked him a male perspective.
He thinks that your DP has some kind of problem aesthetically with the idea of your breasts being anything other than sexual, and is worried that by seeing them as feeding things for the baby he would feel somehow 'wrong' when you return to normality, iyswim, you know like some men won't have sex with a pregnant woman because of the baby.
Or is repulsed by the idea of feeding a baby from your body, the way some people are with other body functions, like vomit etc, though BFing isn't the same as those, it is a bodily function, which some people have phobias of.
Anyway, that's his opinion, he thinks that this is why he takes himself away from the feeding, but that he won't tell you because it sounds stupid, and he doesn't want to upset you, or is embarrassed at having those feelings.
He also said if he slept on the sofa, be it his doing or not, he'd feel really resentful of a special time between couples, the talk before you fall asleep and the intimacy revolving around sharing a bed, possibly causing jealousy of Elliot, no matter how much he loves him, more jealous of his and your relationship, than of him himself.
He also said, maybe you should try giving up co-sleeping, but do not for one moment consider giving up breastfeeding because you're doing a great job.
I agree with him.
Foxy, I can see that, I'd like to think that for VP things could be solved easily by dealing with the bed issue too.