I’ve been in both monogamous, open and polyamorous relationships throughout my life. I’ve always tried to make relationships that will work well for me where I am in life. I never saw every person I dated as a serious romantic possibility or thought that being in a serious relationship was necessary to spend time with someone.
https://dianaverse.com/2020/04/12/polyamory-interview-with-marie-claire
People in monogamous relationships often see their social networks shrink both because they have less time to spend with their friends but also because jealousy reduces the freedom they have to spend time with opposite sex friends or in places where they could meet other people who might threaten their relationship
Sexual Fitness 