I'm really sorry you are dealing with this. I'm actually in the same situation, if i let people in my life its forever unless something insane happens. I lost my gf a few days ago for no reason she said other then growing apart and she always promised we'd have a future. Friends as well in my life always left me eventually even tho i gave everything. They moved on and im still hurting.
Id love to talk to you more if you'd like, i think we could support each other and feel less alone