OK, so you're seeing someone else in addition to me. That's fine. I've got a husband, and I've got you, and it's fine if you want to identify as poly as well.
But geeze louise your picker sucks! I would never say this to your face, but this woman you're dating makes me so mad!
Clearly she lacks empathy. She doesn't seem to have either a clue or any curiosity about PTSD or your feelings or your needs at all. She always wants to take you to parties and big events. She's needy and demanding. It's great that she has given you a job managing and maintaining the apartments she owns, but she criticizes you and freaks out on you. She's paranoid! She accuses you of spying on her for the CIA!
On top of that, she's not entirely comfortable with the idea of polyamory. She's jealous. She knows about me but isn't happy that I exist. (Hello, I was here first, sweetie!) I'd be happy to meet her in some neutral location, to give her the chance to see that I'm a generous and centered person and that I'm happy to accept her place in your life and glad that you have someone else who loves you. Except really, that doesn't seem like a good idea. You call me to make sure I won't be going to that monthly dinner when you and she are going. She knows my name and I'm sure she could find me with a quick Google (and, potentially worse, find my employer), but I really don't want to draw her paranoid attention to myself. Look at how she's behaved already. She saw my profile on the meetup group, the one that was clearly unchanged for the past three years, that said I wanted to date two or three men, and accused me, to you, of cheating on you. Hostile much, F?
And now she's nosing in on my territory, which is the time I spend with you. She gets Saturdays and Wednesday nights. Fridays and Sundays are mine. Maybe you don't realize this, but when you told me last week that you had plans Friday and Saturday nights, meaning she gave you an invitation for Friday night, I was very, very angry. Very very. I don't give you invitations for her nights. I don't even f*cking CALL you or TEXT you when she's with you. All I can say, F, is stay the f*ck away from my Friday nights. It's a good thing you had already committed to something with me, that I had TICKETS for, and that you admitted your mistake and told her no. It makes my blood pressure rise just thinking about it.
You seem to have trouble, in general, saying no to her. You have a history of being with women who didn't understand you and didn't treat you well. Even when you were unhappy and saw that you were being abused, you stayed. For months, or years. I suppose this is what you think you deserve, and what some part of you thinks a relationship looks like.
I assume you are getting something out of this relationship. She is needy, and it's nice to be needed. I'm quite a bit more self-sufficient. I imagine you feel a sense of obligation to her tenants, too, since you're easier for them to deal with than she is. But you know, there are other apartments that need managers, where the owners aren't paranoid or unkind. There are other women you could date who would be kind to you.
You spend the day dealing with her freaking out, and then I get you in the evening, or at the end of the week, and you're stressed out and armored up and likely to take it out on me.
Now she gave you those big pillows for your bed, and a couple more for the couch. OK, they're nice pillows, but next time, I'm moving them off the bed if we're feeling frisky. I swear, it was like she was present. Yuck, and creepy. Sorry, sweetie, if it bothers you that my toothbrush and soap are in the bathroom. Once again: I was here first. You have no idea what I've been through.
How long is this going to go on? Are you going to stay with her for a year, or two, or more?
Are you even capable of breaking up with her? You'd probably lose the job, too, although it doesn't seem like she pays you very much. She would rant and rage and maybe she would stalk you, and maybe she would sabotage my life, too. (I wonder, does she have a history of that?) This woman is quicksand. You deserve better.