When Dave said he had mutual friends with two of Lauren's exes, she said they were never official boyfriends. However, Dave struggled with the fact that his fiancé was talking with another man shortly before appearing on "Love Is Blind," especially since he hadn't had a girlfriend in four years.

"You can't come back from that. Because again, I truly look back and I'm like, this wasn't about this guy. This was about you and the way that you treated me," Lauren O'Brien tells PEOPLE of ex Dave B