Well they are saying that you would only be able to have one person online per that game at a time. The only problem I see would be if people sold it to others who play off hours - people who play in another country. The problem is that, if you wanted to play at 5am some day, you might be SoL. It wouldn't be a comfortable arrangement to sell partial rights to your game... at least, not worth 20 bucks, or whatever you could get for it, if you ask me.
As for the OP, I don't completely understand the frustration. If YOU bought the copy, YOU should be playing with YOUR stats. Tell your boyfriend that he should buy his own copy, or pay you for the one he took. It's entirely unfair that he would disable you from playing multiplayer when you bought the game. Beyond that, I don't see how stats really matter that much, and think you should just play on the same account and not particularly care. It basically comes down to this - are stats worth $40 to you?
I take that back, it comes down to this - are stats really worth $40 to your boyfriend? If so, he should get his own account, because, currently, he doesn't have one, he just uses yours.
edit: That was probably a little bit harsh, but the thing is, this is essentially a multiplayer game. The single player stuff is pretty worthless, to most people who've bought it. By saying you don't want to play multiplayer because of this, you are basically saying your boyfriend took the whole game.
No, it's not like that. WE share finances and a computer, even though, this is actually his computer because he bought it before we were together. Plus, it wasn't planned that I was gonna get into the game. I just happened to try it one day and thought, "hey, this rocks", but that was after he had already created his online profile.
The frustration was that I can't play online as well. I don't mean for the both of us to play at the same time, I meant, he can have his character and his stats for when he gets online and play vs people and that I can have my own character and my own stats when I get on before or after him. I think with DG we can play LAN games simulteneously.. but since our other comp is too basic, it wouldn't run very well.. so blah.
So, if we can have a way to have a different alias under one master account, then that would be great. But we are planning to buy a second copy at that 50% discount Frogboy was talking about when we get another gaming computer so we can vs each other. That would be SWEEETTT. lol