The problem there is that there are now several groupings of representatives – some of them would like to push forward with a "cliff-edge" style exit, some would like a negotiated but "hard" deal, some would like a very soft "technical Brexit", and others would prefer to remain entirely. The parliament is politically bound by the outcome of the referendum—it would be a damaging move to hold a referendum then not implement the result—but at the same time, there is no consensus on what "Brexit" actually means, so it's not currently possible to construct a majority for any individual plan.
It's not a good situation.