What happened (drifted apart)

We were inseparable,
talking for hours.
we always played together,
and she was the one id call.

but then something happened.
you changed.
you met more friends.
you finished school.

before i knew it,
you were out at the club.
you were getting drunk,
and sleeping with any guy that came near you.

you have changed so much,
and it really hurts.
i dont want to see you get hurt,
and i know thats all that will come from this.

we used to be the same.
talking about our vows for marriage,
our pact to never get drunk.
but you changed.

i dont know what happened.
and i dont like this change.
you have let me down so many times.
and i feel that we have drifted apart.