I'm trying to identify a movie about a suburban young couple (20s–30s). Husband suggests seeing other people. They throw a house party with a younger crowd — he strikes out, but she starts an ongoing affair with a younger man.
The young man and wife were having a pretty open relationship, with the young man being at the couple's home often. The husband would come home from work to find the man at his home, but I don't think the husband saw any overt sexual signs except for the first night, when he heard them in the living room having sex on the couch. However, he can't confront her because the whole idea was his.
The rest of the film shows his guilt/jealousy while she enjoys herself.
The movie was probably done in the early 2010s. Serious tone, low-budget; watched it on a dollar-store DVD. Found in a dollar-store bin in a cardboard sleeve. A modern movie setting, with almost all shots being inside a home.