DEAR ABBY: My brother recently called to tell me he had proposed to his girlfriend, and she happily accepted. While I’m glad he is happy, I’m worried about what to do if he asks me to be his best man. While his girlfriend can be a nice person, they have a one-sided relationship in which she controls a lot of what my brother does. She always needs to be the center of attention at family functions and piles on the PDA toward my brother in public places. I feel bad for him because he hasn’t been in many romantic relationships and, to me, it just seems like he’s settling. I may be jumping the gun …