I went to stay with my school friend after she went to Uni in Brighton, she met me at the station with her boyfriend, and said she was really sorry but she had to work that day after all but her boyfriend would entertain me and we would meet up later.
A bit awkward but he turned out to be lovely and very besotted with my friend, so all good. Spend the next day all together and then that night she and I had arranged to see the rocky horror picture show, so far all good, after the show we went clubbing, was all good fun, she suddenly decides she wants to go home, and leaves suddenly, I had checked my coat in at the club so follow her about 10min later once I have claimed it, at her flat her boyfriend has fallen asleep across her doorway obviously waiting for us to get back.
I go into her flat and she has picked up a strange italian guy on her way home and is busy having sex with him in the middle of the lounge were i had been sleeping, I end up hiding in the bathroom.
Eventually they stop and I end up asking what is going on and realise she has been taking something and is completely out of it, Italian guy starts trying it on with me and I end up saying he has to leave as he won't stop pawing at me, which he refuses to do, boyfriend wakes up from his doze on the doorstep and my friend makes out the Italian guy was someone I had picked up.
Boyfriend kicks him out and blames me for putting her in an unsafe situation, my friend just lets me take the rap, and they disappear off to her bedroom.
The next day friend is ignoring me, her boyfriend is giving me disapproving looks and I decide it is time to go home early.
I subsequently realise her drug use is a lot more than I had realised and she is no longer someone I recognise.
We got back in touch years later and she apologised, but it was all a bit late to salvage any friendship