No problem man. There's nothing wrong in not knowing something. Bengalis r known for their uncompromising nature. If it wasn't for bengalis India and Pakistan would never be separated. Pakistani Muslims would have to be remain under the dominance of Hindu majority of India.
That's why they should be thankful to great Bengali Muslim leaders like sir Salimullah and Fazlul Haque for the creation of Pakistan. Without their initiative it wouldn't have been possible to create a separate country for Muslims.
As for ur last Part. We aren't at all worried. More than half of west Bengal and Asam is already populated by bengalis from Bangladesh. Within next 50/70 years it will be a part of ours.
No man, we aren't trying to divide India. Hence, we aren't supporting any terrorist movement or giving shelters to naxalities. But we can do that easily if we wish to do so.
But we aren't doing that cuz a stable and prosperous India is of our best interest. A distabilised India will halt our economic progress and we certainly can't tolerate that at the moment. Having said that, nobody can stop the inevitability. Bengali r our people. We eat, drink and speak similar things and sooner or later they r going to join us.
As for merging, yes, it will definitely take place. West Bengal will merge with Bangladesh in order to form a greater Bangla that we have been all waiting for.