what does "good at being between"mean?
“Eli, he’d slip out, get one of the servants to bring down food and French champagne. I’m pretty sure his parents knew about it. We’d have our own party on the beach, and Eli, he’d go back and forth between. He was good at that, if you take my meaning. Good at being between. Rich and fancy, and everyday. First time I saw Hester, he brought her down from a party. She was in a long white dress. Had a laugh in her, always did. One look at her, and I knew Mary was mine. Eli couldn’t take his eyes off Hester Hawkin.”2. what does "rich and fancy and everyday"mean? does "everyday"="ordinary life?"