DEAR MISS MANNERS: I’m not well-off, and my friend is. She loves eating at nice restaurants. I can’t afford those, so I usually take her out for hamburgers. She knows my financial circumstances. I am very uncomfortable letting her treat me to fancy outings because I’m unlikely to ever be able to reciprocate. When I’ve asked her to take me to inexpensive hamburger joints, she will make excuses like she wants to try a restaurant she just heard about, and I’m the only one who can go with her. Should I refuse to accompany her? Or give up and figure that she can afford it, and that she doesn’t care…