A guy wrote me a love letter?

basically two nights ago i was talking with a friend of mine from school and he told me he found a love letter he wrote me from sophomore year of high school (we are now juniors in high school). the thing is he won't let me read it and he has a girlfriend.
So basically my question is why would he even tell me about it if he isn't going to let me read it and if he's in a relationship?
A guy wrote me a love letter?
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