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"What you are eating can symbolize qualities or skills that you are trying to digest and make a part of your self. Think about what you associate the food or item with to connect with the meaning of your dream." (from: http://www.bellaonline.com/articles/art30246.asp

I think your new someone and that relationship might be "as clear as pea soup" to you? LOL. Mayhaps you're afraid you'll behave (or he will) as you may have in past relationships (automatic pilot/zombie like/doormat so the other person walks over you/eats you?).

The psychotic friend; you know more about him than he's telling you. He got rid of the knife but you figured out he was psychotic from other things you knew about him. I'd explore if there's something about your new love or another friend or coworker, if there's something you "suspect" but haven't even really told yourself about them (or even about yourself; the "friend" could be a mirror for "you"). If the friend in the dream was an actual, real-life friend; check your relationship with that friend, check anyone you know with that friend's name or who reminds you of that friend, etc.

The stuttering/more stuttering=psychotic seems like a literal progression of something obvious to you (so I can't guess what it would be). What feeling, habit, thought, etc. in you is like the stuttering for you that is getting more and you're afraid will get out of hand? What do you half recognize but haven't confronted in yourself?

It could just be you're afraid to hope or commit or something to your new love? New love can be overpowering (whereby simple stuttering become psychosis).