Barry's own best friend from childhood, Curt, thinks that not only did Barry have at least one affair, but that he also killed Suzanne. (pg. 51 AA). That tells us so much, imo!
"After speaking with Curt on audio recording, Agent Koback walked out to the parking lot with him. Curt turned and said "I think he killed her." Curt further stated Barry's timeline does not make sense: the bike thrown down the embankment, the stuff found along the road was placed and it was like thrown out when Barry was "driving back." Curtis also said if anyone found out about Barry's infidelity, they would all turn on him. Barry also "burnt many bridges" in Indiana, referring to business deals. "
He said all of that on May 12, 2020, just 2 days after Suzanne went missing.