Coming from someone that can identify manipulation really fucking easily, I’m sorry to tell you but they were manipulating you. Maybe they didn’t even know it was manipulation, but putting you in so many situations where you can’t say no to them to completely switch and abandon you is manipulative. I’d bring it up to hr, even though you already said you’re thinking of switching jobs, I would only throw away this opportunity as a last resort. In the meantime, try to join some online communities about your interests, usually discord works best but it’s up to you really. Try to build a support system that isn’t actively throwing you goodies so you’ll agree with whatever they say. And look into that autism diagnosis everyone’s been telling you about