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A guy says this when he's trying to get a girl to go out with him. It's a big fat lie. Everyone believes it. Everyone gets heartbroken. The average 'forever' lasts about three months and a half, that's barely a hundred days. You know it's a lie, but you're too stupid to walk away. Then you find out the girl's name is something silly like 'Lily'.
'I will love you forever', said by a guy who had a crush on Lily for two weeks.
'I will love you forever', said right before he dated three other girls.
'I will love you forever', said during a text message at 2 a. m.