He did cheat but only later on. Not when she was pregnant. In the early chapters (I think) it was stated that they were in a romantic relationship. That’s why Jeff blamed Terrence’s sister for everything. (It’s been a long time since I’ve read chapters 1 through 30 but I’m pretty sure that Jeff’s father did cheat).
Chapter 6-8. Jeff states that his parents divorced because Terrence’s sister was having an affair with Jeff’s father and that Terrence and his hosted were living off of Jeff’s father’s money. She was basically a gold digger and he was an adulter that threw his family away. Also Jeff was a college freshman while terrace was a senior when they met again after the hospital incident. But I’m the latest chapter Jeff said “isn’t it great that we can graduate together”.
I know that. But I thought that it was only a suspicion since they only said that because they died together, but they weren't so sure of it. Also, when they found the rings, Jeff told him they may not know the true story but there is no way his Dad's ring would be smaller than Terrence's sister's ring if it was actually a couple's ring, and he promised to confirm from his mum later which he never did. Then in the ending chapters, he said even if his Dad didn't cheat, he still wasn't a good father to him. That's why I was confused.
I think the point is that it didn't matter not he cheated or not. Or if Jeff's dad and Terry's sister were in a relationship. The fact is everyone around them had their own opinions and truths about their relationship and how they died, and this story is dealing with the fallout of that. In life we don't get to see everything wrapped in a pretty bow.
I am kinda confused. Jeff clearly said that his father did not cheat on his mother with Terrence's sister. But why the hell where they with identical rings on when they had the accident? Jeff said his father's own was smaller than Terrence's sister's ring, but could it have belonged to Jeff's mum?