You shouldn't sabotage someone's marriage.
Jared's friend's wife, who has a sister of similar age, is very attractive and Jared is attracted to her.
Jared wants to have a woman for himself.
Jared asks his friend's wife if he can be introduced to her sister as someone to possibly date.
Jared works to undermine his friend's marriage by talking with one or the other and spreading gossip.
Jared and his friend's wife's sister hit it off and start a fulfilling relationship together.
The spouses eventually realize what Jared is doing, get upset at him, and completely exclude him.