Sorry to say this but there are only three reasons I can think of that would cause her to act this way if you haven't touched her for that long. In no particular order they are: She's been a victim of a sex crime and hasn't told you because of the negative stigma women get slammed with for being the target of any sex related offense. She's cheating on you She's asexual and either always has been, but tolerated sex because she loved you and just can't anymore OR her sexuality shifted, which happens with some people. Though now that I think about it, she could just be having some seriously realistic dreams starring you, but with a through-the-roof libido.