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Okay, maybe he's a little nuts. He has either lost all respect for this woman or had little to begin with and should, therefore, sprout some balls and end the relationship for sake of each party's mental health.
What it ultimately comes down to, in my opinion, are standards. Her sexual past obviously doesn't meet his standards, and none of us can judge him for that. There are some people out there who will only consider marrying a virgin. Are they unreasonable? Are they nuts? Perhaps, but each and every one of us maintains the privilege of determining our own standards.
That said, I'll reiterate the point that this fellow probably feels betrayed, disappointed and disgusted by the woman he (thought he) loved and respected and should immediately end the relationship and put an end to the vengeful hurting, insulting and picking.