Isaac Is A Ruiner!
Yeah, so the person who stands between Otis and Maeve is, obviously, Isaac, her new neighbor at the trailer park. It was obvious soon after we met Isaac that he was into Maeve as more than a friend, but also that she appreciated his sarcasm and the fact that he'd also dealt with parents with substance abuse issues, two things they had in common.
Isaac could have been open with Maeve about how he felt, but he seemed to see that she and Otis also shared more than friendly feelings, which led his jealousy to come out. Toward the end of the finale, when Otis is looking for Maeve, he asks Isaac to tell her to listen to her messages. Maeve has actually left her phone behind to run to the store, so Isaac listens to the message himself, and promptly deletes it, likely hoping that Otis won't have the guts to tell Maeve face to face without her first hearing his declaration. And, with those two, it's possible that he's right.
