I went through this when we were in separation.
It’s a natural reaction to fearing you’ll lose that intense twin flame bond. It hits like a truck and isn’t like any kind of jealousy a normal connection will experience. Highest of highs also means the lowest of lows.
Jealousy shows up as fear of losing them, or even envying their progress in life. Root cause is insecurity either way. Left unchecked, it poisons the vibe. Nobody likes jealous energy, even if they get it, and that is the twin flame runner’s perspective in a nutshell. Pushes them further away. I had to face that jealousy blocks you from feeling the love fully or doing your inner work. It keeps you stuck in your lower self. The universe isn’t subtle with these lessons. Not shaming you. We all get jealous.
If you’re obsessively checking who they’re talking to or liking their posts, pull back and go inward. The jealousy is highlighting what needs healing in you.