After your argument ensued, between the sip you took and the vile things he said to you, what sorts of things did you say to him? I know you took your share of responsibility for the argument, I'm actually asking because though you may very well love him, it sounds like you both are in a place where what's most important to each of you is meeting your individual needs. There is a tremendous amount of anger coming from him, and that leaves me wondering which of the following is the case:

A) he is a cruel, evil at heart narcissist, who keeps naked photos of his exes and porn in order to satisfy the sexual desires he has, whilst knowing you want sex, simply to prevent you from having your needs met, as one of many ways he abusesyou routinely. He is horribly mentally and verbally abusive, and routinely tries to hurt you for the sheer masochistic pleasure of doing so.

Or

B) you, either unknowingly or purposefully, have been manipulative, devaluing of him as a male, and cruel in your own right, thus causing him to withdraw into a safer place, a place where there can be no sex with you because he will not allow himself to become intimate/emotionally vulnerable again with a woman who has hurt his heart so greatly over the time you've been together.

The only reason I would even hint at B is because for a man who clearly has a sex drive, (many hours watching porn and masturbating) and enough so to have taken naked photos of exes and used them for his spank bank, something had to drive him to find sex so "unhaveable" (for absolute lack of wanting to use a term that could cause unnecessary pain) with you specifically. I'm sure it isn't your appearance, as men in relationships will usually have sex even with women they are no longer attracted to just for the sake of sex, UNLESS they are also very angry with said woman.

Either way, I would agree therapy is a must. I think it's probably going to be for you alone right now, however (& possibly him as well, but independent of you), because there is something really unhealthy and angry happening here, and I would bet the bank it's about far more than just sex, as that, it would seem, is probably merely a symptom of some really deep level anger coming from him at this point. His commentary and behavior towards you indicates as much, and the only question left is whether it's a symptom of A or B above (or something else completely unrelated to either).

Getting away from one another in light of so much anger on his part, (as I see it) was a really good plan, IMO. If I were you, I'd move on with your life and start that therapy! Best to you, I pray it works out for both of you!