Teenage relationships can last from days, to even years. Maximum would average out to be around 2 years. Once in a great while, usually for upperclassmen, teenagers end up getting married, I'd say 1/1500 do this. Which would mean for an average highschool, one couple will end up getting married per 4 years.
But with middle school children relationships are usually much shorter. Usually Latin from a couple weeks to a month or two.
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