My boyfriend said that he'll love me forever..... How do I know that I can trust him?

Tomboy
I am not really sure if there is such thing as love and it drives me up the wall when he says things like I'll never leave you or I'll love you forever because we are only 17 turning 18 this year and people change after they get out of high school and since he wants to go join the army... I don't see how he can make such unrealistic promises. When I ask him if he was serious and not just trying to flatter me he said that he is serious about it. ='( Can someone explain to me how I should take this because I don't know if I am being realistic or cynical or if I should trust him.
My boyfriend said that he'll love me forever..... How do I know that I can trust him?
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