Happened to me too and it was heartbreaking. He is definitely jealous even though he is so young. I'm afraid you will have to continue to be thick-skinned and stick to him even more. If you can, spend more time with him alone without any other family members around. This is so that if he rejects you, there is no one else he can turn to except for you. He will get better as long as you constantly show him that you are always there for him. It will take time - don't give up!
Anonymous