What to do with old letters?

Lately I have realized that I have a lot of letters from ex-boyfriends that I don't know what to do with. Granted, not all of the memories associated with them are bad....but they (the letters) don't make me particularly happy so....is it alright to just throw them away? I think I found a poem that helps me answer this question......

I Did Not Keep Your Letters

I read them,

and then I threw them in the trash,

but make no mistake, I read them.

I swallowed them whole.

I filled my eyes with every word,

I sewed them in patterns

into my flesh of my body,

at night I wake to entertain the ghosts

lounging in my bedroom

with impromptu recitations

of your letters, of your thoughts,

of the shape of you in words

but I could not keep your letters.

I could not let them languish

in a dusty box, fermenting

into poisons in the closet dark.

I could not let them lie in wait,

like coiled paper vipers

ready to strike the hand that strays

too far and stirs the den.