To think unhappy people sometimes don't want other people to be happy

[Stilted]

They aren't happy for your achievements
Rain on your parade
"I don't mean to put a dampener on things but..."

Often try and undermine your confidence..

Livid tbh!! Sick of their shit !!

I've not really experienced this myself too much, I did have a friend who seemed to revel in my misfortune though. I remember once I met up with her after I'd lost my job, I was really upset and worried about finances as I had debts to pay at the time. She was very briefly sympathetic before she started boasting about her bonus from work and saying "I wonder what I can spend it on, hmmm I might get a new TV"!