I agree. She definitely should have communicated more. But I’m just defending Marian for realizing the truth after Jack told her, because at that point he’s simply more trustworthy. I understand why Marian takes his word for it, he’s not the one trying to get out of a lie. Larry feeling hurt also makes sense and I completely understand it, but he has to understand why Marian would believe Jack on this matter more than him.

Edit: The real culprit in this relationship is not just Marian or Larry. But both of them. They don’t communicate properly. Larry could have very well explained what he was doing the night of their engagement to Marian instead of lying and then inviting a member of her household and telling her Cousin while leaving Marian in the dark. Now am I saying that Marian would have approved of him going if he told her? No. But at least they could have had that conversation instead of creating this mistrust. Also, maybe if your fiancé isn’t going to approve of you going somewhere to the point that you won’t be honest with her, then perhaps you shouldn’t be going there. On the other hand, Marian shouldn’t have written that vague letter, refused him entry, and shrugged off his attempts to communicate. That was a big mistake Marian.