Thoughts about my chaos please?

Girlfriend in an argument over an un resolved issue of another girl that pops up out of nowhere and leads up to him putting his hands on your neck to shut you up... Then pulls away and says he wants to smother you with a pillow so he doesn’t wanna hear you talking ! I don’t know what’s scarier , the fact I wasn’t even scared! Thoughts? 3 year relationship.. was intense love for the first 2 years! I think I’m going fucking crazy!
Thoughts about my chaos please?
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