I personally liked it; it's simple, straightforward, has good scenes, and a great start.
However, it lacked a few small things, like having more of the husband's thoughts, options that influence Heide or even herself.
I also wish the husband could branch out between simply accepting the betrayals, being oblivious to his wife's actions (like her openly flirting, kissing, and caressing other men, and him internalizing that all of this is never normal for her without suspecting anything she does, like that).