fp showing a single symptom is making me freak out

I have never met anyone else with bpd that has experienced this but if my FP starts also showing any symptom of bpd it makes me so anxious and causes panic attacks and i have no idea why, today he said to me, “My life literally sucks when im not with you though, its just like a constsnt flatline you know theres absolutely nothing going on in my head its like im not even alive and then im with you again or we’re talking and im happy again” I know he doesn’t have bpd but the idea really scares me and i don’t know why, can someone reassure me that what he’s sharing with me here isn’t an exclusively bpd thing??