[Dimensio]

i am not even trying to make a point, i really want to know why I cant carry a concealed weapon in MA if i have a license to do it in another state.

I think that this is because MA doesn't permit for concealed weapons. This is different than marriage, where all states currently recognize marriage between two people. If there were a state without marriage laws (that is, the state does not formally recognize marriage between any couples, and grants no benefits therefrom), you would have a similar case where a couple from another state would find themselves without their union recognized by the marriage-less state. Of course, because marriage also entails federal benefits, that does open up another can of worms, though IIRC no state is actually required to provide for state-level marriage benefits.

Moreover, I'm not sure that the paralell works as nicely as you want because marriage is a civil contract while concealed carry permits are, as you said, permits. Concealed carry permits are not "contracts" between parties, so there's nothing for another state like MA to recognize with respect to a legally binding agreement between two (or more, in the case of non-marital contracts) parties.

I think that MA (and every state) should allow for concealed carry, but that's another debate.