Dear Annie: About two years ago I was pregnant with my firstborn. About five months into the pregnancy, my partner, the father, cheated on me. When I found out about it, I was devastated; I didn’t know what to do with myself. I felt he did it to me on purpose with the reasoning of “getting even” because I’d cheated on him years before. It was one time, and I felt pushed away and insecure at the…