-- I don't know either of these people. I doubt that I care to. It's obvious that when you give out your account information that you leave yourself vulnerable to worst case scenerios. -If- she did give out her account information than she must have had to have trusted him. To be betrayed by someone that you trust is by far worse than being hacked. Both sittuations are absolutely terrible and have happened to people. Whether it happened her, I don't know. The story gets a bit shadey as I read it (on both sides).
To say: "She gave out her account information. It's her own fault." As much as I'd have to agree, I'd also say that's the biggest cop-out. If you left your keys to your house/or your car at a friend's house or even on their coffee table and they used them to steal your car (whether for a joy ride or for keeps) or break into your house.-- They're still a thief.
To say: "I've given him my account information, or he has my password and nothing has ever come up missing." It's still a cop-out. Not all theifs are kleptomaniacs. Some will will make no alligiences and steal from anyone, but generally this is not the case.
To say: "She aquired her gear via RMT so it doesn't matter if it was stolen" - Again, a cop-out. Doesn't matter if she has stock in the IGE company. There are no robin hoods on the internet regardless if it is a fantasy land.
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He might not have done it. Internet-thug or whatever-- this could be a cheap cry for attention by the OP or a shameless means to ruin the reputation of the acused-- but he seems to do that on his own. So, again, it doesn't seem to fit that she'd be lying unless she does it a lot.-- And then you have the worst type of liars because they do it so well that it's very believable. On a side note: If WHM was so important to you than I don't fully understand why you would not want to take pride in accomplishing beating him first-hand rather than taking an easy route out. Btw: The fight is VERY EASY!!! I don't fully understand how someone could lose it after at least a few honest attempts. Especially having the type of gear you have mentioned unless they had absolutely no skill and even then all you need is medicines and a macro to spam it with. Didn't use a DS+Cure? I heard that will do it.
The OP wouldn't have been the first person, however, to give out their account information for the sake of advancement in the game. I've been asked, in the past, to do similiar tasks. I've declined for the sake I don't want the responcibility of other people's accounts. The only exception was offering to power level a character for a friend of mine in real life--.
Now if he romanced her to get what he wanted-- he's a scum bag. Never mistake kindness for weakness. Saddly, in the end, it is the cause of why most have a hard time trusting anyone-- and why kind people slowly begin to become exactly what they had been fighting against.
To the OP: IF what you say is true than I am deeply sorry and would completely understand why you would not wish to play again. However, if he did rob you don't give him the gratification by showing him so much emotion. Learn from it, and move forward. Find another game or a new hobby. Or create another character whether or not it be this server or another and start over with the knowledge that you obtained.