<human>: My boyfriend recently wanted to change our relationship status to polyamorous.

But before then, he just wanted to have friends that were girls.
Most of the girls he became friends with were not very friendly to me (or not my taste, friend-wise) and I became angry with his friendships and told him I did not like the girls he hung out with. I was very jealous and angry.

I feel like at this point I am emotionally entangled with my boyfriend to the point that I can't escape or resolve my jealousy issues.

My boyfriend gives me a lot of talks and support about our problems and my jealousy; but he also prompted an ultimatum about having more friends that were girls--that he could not continue dating me if I would continue to break up his girl-relationships.

The problem is, I fully understand his commitment to meeting new people, but in practice I'm falling apart. He says that if I leave (even for vacation) for a couple of weeks, he's going to pursue another person to have sex and a relationship with until I get back. I'm not totally sure if he's joking or not, but I feel partially that this might no longer the person I started dating seven years ago.

I feel like saying that if I leave town that he's going to full throttle into polyamorous relationships is emotionally manipulative, and makes me fear that I am going to lose my lover and best friend, and makes me never want to be far away from him. 

On the other hand, I want him to have space and be able to have a relationship with the other half of the populations without me flipping my shit. And there are so many great, unique, loving, and beautiful things about us that I'm being crushed by the inability to resolve these problems.

Anyway, this situation is causing me to have anxiety attacks and is having a very detrimental result on my mood and I don't know what to try to think about. I don't want to lose him. But I don't know how to break the cycle.

Give me the gist of the text in a nutshell
<bot>: I have some emotional dependence issues with my boyfriend, but I'm not sure how to sort them out. What should I do about my jealousy?