Dear Abby: Incarcerated man thinks his brother slept with his girlfriend

DEAR ABBY: I have been incarcerated for 21 months. I stay in contact with my immediate family, except for my brother. I suspect that he slept with my girlfriend a couple of weeks before I came to prison, although I’m not 100% sure. He tells our family members that it isn’t true and that he wants me to reach out. But I don’t know if I can until I’m completely sure he didn’t do it. Do you have any advice? — LOCKED UP IN DELAWARE

DEAR LOCKED UP: You are locked away with little but your suspicions to keep you company. Under these circumstances, I can see how they might grow. Why do you think your brother did this? What “vibes” did you pick up on before you left? If you really think your girlfriend would do something like this, why do you still consider her your girlfriend? If…