<human>: Can you provide a brief rundown of the text in within 3 sentences?

So we are going to call my GF "GF" and her friend "F", and the sister of my GF "GFS"

F and GF are not really close as I Thought they were.
But F always asked about GF to me, how she was going, because GF is quite pretty and adorable, but GFS is a complete mess and an horrible person. GFS is a student at the same university departement as F, and that's how F knows GF

So F asked yesterday how she was going, as she usually do, and I told her that we almost had sex saturday (GF is Virgin and close-minded), and she was quite happy, because F cares a lot about GF and really wishes about her happiness

Turns out when I told GF that i told F about this, that she totally didn't like it, and started insulting me. She Hanged down the phone and didn't answer until this morning.

And i had a load of bad dreams which brought me to wake up at 5:30 am drenched in sweat.
<bot>: TIFU by telling my gf I told about us having sex to one of her friends; now she hates me and wants me almost dead.