Gut feeling.😢

My fiancé and I have been together for almost 2 years, and I can't shake this feeling that he wants to break up. Even though we've had really enlightening talks and he's definitely reassured me he doesn't want to break up. I just can't seem to get this feeling to go away. I DO NOT want to break up by any means. Anyone ever gone through this? Any advice? I feel helpless. 😩