If you TRULY love someone....than you'd want them to be happy...so if they dump you...yeah...it'll hurt...but at least you can say..."Now they're happy...I guess i'll just have to move on..."
but if, say, you were forced to move away and you had to break up with your gf/bf than you'd feel Horrible, because
1) you don't want to...
2) It'll probably hurt them and make them sad..
So if you r truly in love...dumping them is the hardest...