Its whole history is littered with conflict, conquered numerous times, used as a pawn in global power struggles, and that's before you get into the internal conflicts, It's cursed for where it is more than anything as it really dosnt have anything in the way of resources to offer other than its geography to anybody outside its borders, (beautiful country in parts by the way).
Britain has been there fighting on and off for 250 odd years, first Afghan war, second Afghan war and various other times since, between the world wars, right up to the present day.
If you read up on it anybody who believed an Afghan leader will keep their word, is sadly going to be in for a bad let down, can only think of the truce during the Indian mutiny when they have kept their word, ironically the one time they shouldn't have as the British would have lost control of the area, we only had 50,000 British troops there, the rest of the army 300,000 was Indian born and largely in rebellion, if the Afghans had invaded it would have been only led one outcome.
It would ironically backfire for them as the second Afghan war was to follow, The army of retribution, decimation of the Kohistanees and their capital in revenge for the retreat from Kabul.(in the first war) hardly hearts and minds strategy and will have tainted the British memory in that country for ever.
Its never gone well for us or the Afghans when we mix, better to leave well alone. we have never been welcome and never will be, so why do we bother.
I expect India to be supported by the west in the area to counterbalance the other forces at play in the area, large military spending already by the Indian government and joint operations between them and western forces, think there has been two with the Royal Navy this year already.
Don't think we will directly get involved with troops on the ground any time soon, but are meddling will go on.
The Afghan people as will always pay the price, in some ways a stable Taliban government might give them some respite from the turmoil.