I'm sorry all this is happening. It's hard to give feedback when your post is so sparse.
Just some reflection questions to try to help you. Don't feel like you have to answer them all here. You do not have to answer any, just maybe think on some of them.
I recently entered my first poly relationship with a woman that identifies as ENM.
Are you both using words the same way? Is this the problem-- you want polyamory, where you date and have more than one BF/GF/partner-type person to share romance and sex with, but she wants ENM/open for casual sex instead? Or some other kind of non-monogamy?
I really wanted to learn about the lifestyle and integrate myself.
What "lifestyle"? What are you integrating? Do you want to learn about polyamory and integrate this into your own life and start poly dating? Or you are trying to integrate yourself into her life? Or is there something else you are integrating?
But I've struggling with a cyclic pattern of jealousy. Every 5 weeks, I go into a spiral in which I start feeling uncomfortable with certain aspects of our dynamic.
What aspects of this dynamic are uncomfortable?
What behaviors does
she do that you don't like?
What behaviors do
you do that you don't like?
What happens every 5 weeks? Why so specific?
Does she travel for work, and it happens when she's gone or gets back?
Something else?
Every time, it gives her the impression I'm trying to break up with her when I feel I'm trying to verbalize something. So it creates drama.
I'm going to guess. I might guess wrong. Is that how she shuts conversation down with you? Takes it to the break-up place and wigs out, and you end up having to "comfort" her, and then somehow your original concerns never get discussed? They get side-stepped?
Does she expect you to be her emotional regulator, rather than regulating herself?
It feels like some toxic masculinity tendencies popping up, or just my nervous system spiking up on a cycle. Has anyone experienced something [similar]?
What does this mean?
What toxic masculinity tendencies?
Did this happen to you before in past relationships, your nervous system spiking every 5 weeks? Or is it just with this one person?
Ultimately,
someone has to be the first non-monogamous person you date. It doesn't automatically mean they do non-monogamy well, that you both want the same kind(s) of non-monogamy, or that you two are compatible enough in interests, values, lifestyles.
It's like any other dating. Some potentials are going to be a long-term match; some are not.
It's okay if this person was a gamechanger in the sense that they made you realize polyamory existed/was a possibility. But it doesn't necessarily mean this is long-term compatible -- esp if your nervous system is taking hits every 5 weeks.
If you two recently started dating, and it's this much drama already, it's okay to end things politely and bow out. It's okay to want something more calm. It's okay to not want drama.
Galagirl