It's so frustrating to be made to feel like you have to explain every last thing to people. I have friends and some family members who try to offer suggestions and/or alternatives when I say I can't do something. As much as I know they are just trying to help it gets so tiring to have to explain my reasons over and over again. I've gotten to the point where I don't even tell anyone if I'm feeling bad or need something but can't go out to get it. It's a very isolating feeling. I really hope your "friend" shapes up.