This article by Science of Relationships lists six ways someone might stay friends with an ex after their relationship ends, and examines the factors that are most likely to cause someone to stay friends with an ex. The article argues that mutual physical attraction, friendships from before the relationship, family support, and mutual breakups are all more likely to result in a post-relationship friendship. It also theorizes that homosexual couples may be more likely to stay friends after a relationship.
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Staying friends with an ex after a breakup may be easier than you think! Great article worth a read