No, you are not at all being too sensitive. BDSM is something that needs a great amount of positive reassurance from both sides, and more than anything you need to wholeheartedly trust the other person. And that takes time and care. Especially if you're doing a BDSM scene, you need to carefully plan out time out of your day to both engage together in a space where you feel safe. And honestly, him smoking meth is a huge red flag in the first place. I understand that you feel thrilled when you don't know what he's going to do to you, but you shouldn't legitimately be scared. Consentual non consent is fun, but it remains play, not real life. So please, please be careful. Also, it's only natural that you experience subdrop (feeling very Submissive/sad/passive/angry) after a scene, since it takes time to get out of that kind of a head space. This is especially true since he broke it off in the middle and made you jump out of the window (which is in itself also really humiliating). A Doms job is to provide aftercare, and that's part of the experience, and if he doesn't I honestly don't think you should engage with him anymore. And in any case, you deserve so much better. I know that it's hard to stop engaging with someone you had a pleasurable experience with. But he honesty sounds pretty toxic, so you're not missing out on anything :).

Anyways, I hope you find better suited partners to experiment with in the future. Don't rush it though, this takes time (I myself had a few bad experiences before meeting a really loveley dom I wouldn't change for the world), and if someone isn't willing to explore with you, it's not worth it.

I hope this helps!