Dear Bahamut,
I think all of us have experienced terrifying nightmares like that from time to time. The important point is not to take them literally. Dreams are funny things. They speak to us in a symbolic language that can be difficult to interpret.
The girl, Rheza, what does she mean to you, or represent to you? By that I mean, which qualities does she embody? Goodness, Truth, Light, Love, Innocence, Beauty, etc.? These could be things that are in you right now that she is representing. Whatever they are, you may be perceiving right now that something is threatening them (the husband/psycho murderer). This often happens under times of stress, or when you feel that something in life may be forcing you to compromise your virtues.
I cannot interpret your dream for you, but just point you to the key symbols to help you ferret out its meaning.
What do the colors "beige" and "grey" represent to you? And your classroom? This is the environment you find your problems currently in.
A wedding or a honeymoon may indicate two forces that are tied to each other. Possibly Rheza's "virtue" wedded to animalistic drives. If there is a conflict between one's baser self and higher self, it could be represented as such.
The fact that you were with friends afterward may indicate a falling back on the group ideal, on reliance on your peers to help make a decision or come to a resolution.
It's really hard to tell, and I'm not a dream therapist, so take what I say with a grain of salt. But if it gives you a starting point to work with interpreting your dream, great.
Remember: only you can decipher those symbols. They have different meaning for different people.
Blessings,
