Yeah, I get heart chakra pain too. When my twin is with someone else (especially if they’re sleeping with someone else), it gets really intense. You actually feel it physically in your chest like a weight.
When I write out what I’m feeling or try to process it, the physical pain usually gets better, even though I still feel sad. There seems to be some kind of energetic thing happening between twins where they can sense when you’re working through stuff on your end. The telepathic side makes it both easier and harder. You can stay connected but that also means you pick up on things you don’t want to know about.