Anthony, here are some defintions of mitsein. It is a word used worldwide, and has a consistent meaning. Mitsein is meant to convey 'togetherness' but I like the last definition the most by Michael Eldred:
"Thus the essence of the relation between consciousnesses is not the Mitsein: it is conflict." [Being and Nothingness, Sartre. 555]
In this instance war is extreme conflict, whereas Mitsein is harmony or togetherness, it could even be solitude in the sense of sole - at - one- ment, to be one in the sun, a single lumination. This sol at one ment is related to a tone ment and a tune ment. (See Sein und Zeit, 'atunement')
Like Sartre " why does love always end in frustration"?
Well at least it does not end in 'demoralization' except in dramas like Hamlet.
http://www.student.kuleuven.ac.be/~m0324598/writ/Existentialism%20-%20Sartre.pdf
"Listening to... is the existenzial openness of Dasein as Mitsein for the other. Listening even constitutes the primary and proper openness of Dasein for its ownmost possibility of being [...] Listening to one another, in which togetherness [Mitsein] is cultivated further, has the possible modes of following, accompanying, the privative modes of not listening, resisting, defiance, of turning away. (translation ME)" (SuZ 163)
As essentially Mitsein, Dasein cannot help but listen to others and thus explicitly share the world in speech. Even in not following what others say, in disagreeing with them, Dasein is sharing its being-in-the-world with others. M. Eldred
http://www.webcom.com/artefact/wrldshrg/wrldsh12.html
"Mitsein is indeed being-in-common, viz. in the shared Da. By virtue of the Da,
humans share the truth." Michael Eldred
http://lists.village.virginia.edu/listservs/spoons/heidegger.archive/heidegger_1997/heidegger.9704
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