hi prachi. i dont think there is any problem with ur dog. his behaviour is pretty normal - no crying for a long time, no destructive behaviour, he eats well, he sleeps and eats his bone when left alone. such a good doggie!
it seems to me that his attempts to stop the people from going out of the house - not only family members but even guests - are created by people themselves. like if it happened a couple of times that while going out they cuddled him too much, hugged and kissed him asking to forgive them that they are going to leave him, thus attracting too much of his attention to the very process of their leaving - that could have created undue exitement in the dog which lead to pulling their jeans and trying to stop the people from leaving. if it was repeated several times it resulted in certain behavioreal pattern for the dog because he knew that in this way he could get more attention.
as for him missing ur husband or u when u also leave - dogs are not people, they do not recollect familiar faces or events when they do not see those who used to be there with them and then left. they hate to be left completely alone, but if there are other people around them to whom they are also attached, they would be pretty happy in their company. they would not sulk remembering that u were there for so many months and suddenly disappeared. but when u return he most probably will recognise u with joy.
believe me, there is nothing like ur dog is trying to figure out if everyone is going to leave him or someone still will stay with him. and he does not think or dream every night about ur husband who left for US several months ago. he is happy to see those around him. and there will no be any stress for him at all as he is going to stay in the same place with the same people to whom he is so attached.
excuse my simple english. i think the same things could be described using some scientific therminology, but it is difficult for me. but believe me, i know dogs" psychology well enough. dont worry for him and join ur husband without ur heart crying for ur dog!