First question here--putting aside the sex question for a moment, how is the relationship going otherwise?
I fully agree but the only way I can see to resolve the problem is for him to admit his part in it and he seems unable or unwilling to do that. Unless he does that, talking about it between yourselves just won't make any difference since he'll always say the fault is entirely yours, and that simply just isn't true.
Seeing a therapist again might help you more effectively communicate with him but other than that there really isn't anything more your can do here except, perhaps give him the ultimatum that either he seeks therapy or the relationship is over.
Let me know if we need to discuss this further Jasmine