I'm confused. .

>I’ve noticed that if I [f30] say anything negative about myself to my long term partner [m30] when I’m in a rough place, he actually goes in his head like “oh she’s right, she IS blah blah”.

So why are you lying to him about your insecurities? Why are you trying to get him to say "no no, you're not.."?

> If I say something about myself, he won’t say “oh that’s not true”,

Why would he belittle your feelings or reject them? And why would you want that?

>. This makes me feel that I can’t share worries or vulnerabilities with him.

How are you phrasing your worries or vulnerabilities?

>This does trigger my abandonment issues, and I don’t know what to do

You have issues. Seek therapy.

> I’m being ignored

How is he ignoring you? What triggered him to start ignoring you?

>And it’s triggering me.

And what happens when you're "triggered"?