Most Helpful Guy
Sounds a bit weird - It is either casual or a relationship.1
The level of commitment i suppose. I say a serious relationship entails making plans, decisions together, introducing each other to family. In semi-casual relationships, there's no planning for the future, decisions don't have to involve the other person and of course there's no need to meet each other's family. I also suppose the defining factor is if each person is only exclusively seeing each other or allowed to see other people.
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