It's just the two of us at the moment, and we're both pretty stubborn people anyway, but this is starting to affect our relationship.
He's an independent and resourceful little boy, always wants to do things for himself. Mostly I'm happy to encourage that, but there are obviously some things he still needs assistance with. He flatly insists he doesn't need help, and throws a strop when I try to explain why I'm helping, which bit is causing the problem etc. Then I get frustrated because I can see where it's going, which can result in yelling and sulks and I hate it. Often it's a self-fulfilling thing; for example, he has something fragile and is being careless with it. I ask him to give it to me and tell him why, he refuses to relinquish it and in the process breaks it.
We used to get on so well, he was never one for tantrums and was such a good listener; we could always reason stuff through, but now he just keeps going, convinced he knows best.
I'm sure this is a stage they all go through, but I don't know what to do!!