Is there any word in English for a person who is unable to change himself for someone else regardless of he/she wants to change or not? He just can't change.
I'm writing a play and I need that word for a specific scene if there's any. The scene is, boy B and girl G are in love. Both love each other. But the problem is B can't change his bad habits like smoking and gambling etc. But sure he wants to change. But he's just too addicted and he can't. So G will get the dialog "Look I still love you, but you are too [something something]. You can't change yourself even for your love". I need something to fill in brackets. I thought of stubborn.