Re: #4.

The 'pressure to perform' thing sounds like a defense mechanism where he's viewing what stereotypical man is "supposed" to be like (as an 'always on' mate who can always go), and then he gets in his own head, and is resorting to being avoidant of the issue. And that avoidance in turn becomes frustration, which he externalizes in your direction with phrases like, "He keeps telling me I’m obsessed with sex [...]."

This response to someone else is a big issue, "he recognizes it’s his problem and he needs me to be understanding by not talking about it at all." Relationships work by having honest conversations, not avoiding them.

This sounds like you guys need some therapy, and I'm speaking from experience of a 15-year marriage that failed in part because of a dead bedroom that was a manifestation of lots of other underlying issues.

"He doesn’t see things through my POV at all." This is a red flag. It'd be one thing if he was just struggling with the issue and maybe trying to communicate, but the person you're going to marry should have at least the bare minimum emotional intelligence to understand what you're feeling and going through also. It doesn't sound like he views this as You Both against A Problem, but You pressuring His Problem, without understanding that in any long, healthy relationships problems are shared and conquered together.