Dear Annie: I’m a 20-yearold girl, and my boyfriend is 24, soon to be 25. We’ve been dating for about three months, and he’s the best boyfriend I’ve ever had. This is only my second relationship and his fifth. Unfortunately, two of those exes weren’t very nice; one cheated on him, and the other left him for another boy. The other day was my first day at a new job. My shift was from 3 p.m. to 9 p…