DEAR ABBY: I’m a 26-year-old single man. Most of my good friends are getting married, and when they do, they stop speaking to me. I have a hard time not resenting them for it. It makes me feel my company was a placeholder until they got married, and I’m not worth keeping around now that they have what they really want. It makes me feel like a second-class citizen. Is this typical behavior or am I …