I'm sorry you deal in this. While it sounds like it is happening in a poly context, this isn't about actual polyamory. This sounds like it's an unhealthy or abusive relationship.
I don't know if it helps you to see it like a bullet list. But this is what I get reading your post.
- He has sabotaged every meaningful relationship I've had outside of him.
- He has trained me to not get attached to new people (or excited about NRE with them) because he's just going to do something that ruins it
- In the back of my mind I'm just waiting for him to do something that ruins my current relationship
- He does poor behaviors.
- he reads my phone without permission
- he sends texts from my phone without my permission
- he doesn't let me spend the night with my other partners because he'll "be sad." (Basically emotional manipulation)
- I think about doing same bad behaviors to him
- He shuts me down completely
This doesn't sound like a healthy relationship.
I hate this. I don't know what to do.
I think it might be time to break up with this partner
because you hate being here and hate this. So don't be. Your consent to participate in things or not belongs to YOU. If you no longer consent to be here, get out. It might take time and money to leave, if you are very entangled, but you could decide to be done with him
today. You could decide to start planning your safe leaving plan. But be careful. The leaving time is a dangerous time, especially with the ones who are all "If I can't have you, no one can!" Scary.
Use our interactive safety planning tool to create your personal safety plan. This series of questions help survivors identify their options.
www.thehotline.org
I normally encourage honesty and truthfulness, but if you are in an abusive-sounding relationship, all bets are off. You do not owe people who are HARMING you anything. If you have to lie, cheat, steal, or be "fake nice" just to make it to escape day, you do what you gotta do.
Depending how bad you have it there, you might consider talking to a hotline and/or a counselor so you can leave, and STAY gone, and not get sucked back in. Especially if he knows how to play on your soft feelings for him, and manipulates you because he "gets sad," you will need support to NOT listen to that anymore so you can stay gone.
Internet people might be able to help you with one or two things, but this sounds serious. Here are some hotlines for appropriate help:
https://www.thehotline.org
en.wikipedia.org
I'm sorry you are dealing in this, though. I hope you can get out okay.
Galagirl