Have you ever told her that you do not feel loved by her (or, whatever it is you feel or don't feel)?
Have you considered being very honest with her about what has been going on inside of you, starting by talking about the elephant in the room -- that you've been short and "in a bad mood"?
Gee, I don't want to put words in your mouth or assume I understand how you feel, but I'm wondering if you've had a conversation like this (or see any potential value in having one):
"You've probably noticed I've been very distant and short lately..." "I don't want you to misunderstand why. Do you have any idea why?" "Well, that's very interesting, I can see how you might think that, I guess, but the real reason is that I'm finding it difficult to be around you, because...." "I don't feel like you even care if I feel loved..." "I have a need to feel/know/____________________and either you think this is a foolish need, or you don't understand how important it is to me, or you just don't care." "I'm starting to feel like which it is doesn't really matter..." "Something really has to change, or I fear our relationship is doomed...I already feel like, emotionally, we are, irreversibly, separating -- and I don't know how to stop it."
Again, I don't know how you are really feeling. What I'm wondering is if you've even come close to telling her what is really happening inside of you, and what you need and are not getting.
