Recent revelation of affair threatens to break up family

DEAR ABBY: I just found out that my boyfriend of 12 years slept with my stepmother last year. She doesn’t know I know, and now that I do, I struggle with it. Should I tell my dad what I found out, confront her or let sleeping dogs lie? I am deeply hurt. I feel like my heart has been torn out. How can I forgive and forget this? — WOUNDED IN UTAH

DEAR WOUNDED: How did you happen upon

this news? Did y…