It honestly depends on the age in my opinion because a 7 yo could have a gf and they could break up but most likely they’ll be mad/sad for a day or two but then find someone else. Maybe if your talking middle school ages though it matters on your mental mind
set. If you have a optimistic or happy mind set then you’ll be sad for a week maybe but if you have a negative mind set you might be going into depression cause you it will be a hard take on you. If your talking high school then no it’s fine high school is like dating as adults since your literally one in a few years so yes you’ll either be sad or fine with it but you’ll get over it.