this is not based from any experience but i always see these reasons in movies and tv shows!..:
[b]1.[/b] [color=red][b]"Im sorry, i just realized that i cant commit into a deep relationship like this.."[/b][/color]
[b]2.[/b] [color=blue][b]"Im bored...............lets break-up! you know, for a change?!"[/b][/color]
[b]3.[/b] [color=green][b]"When people change, feelings change too..you changed! and so is my feelings for you.."[/b][/color]
[b]4.[/b] [color=darkviolet][b]"I just dont love you no more!"[/b][/color]
[b]5.[/b] [color=#660099][b]"You had me at hello, now, ur losing me at buhbye..cheater!"[/b][/color]
[b]6.[/b] [color=#9900CC][b]"
thats the last time youre gonna get one! Im through with you!"[/b][/color]
[b]7.[/b] [color=#0099FF][b]"I have always loved u, but now i think its time for me to love myself!"[/b][/color]
[b]8.[/b] [color=#FF3300][b]"Its Over!!"[/b][/color]