People with BPD who are in long-term relationships… how did you know they weren’t just a FP? How did your family/ friends react?

I fall so hard and fast that I usually can’t tell if it’s love or infatuation. I can confidently say that I have truly loved romantically in the past, but sometimes when I get a new FP, it feels exactly like when I loved pre-BPD… but on steroids. Is that the difference? Does it feel like more of a calm love, or will I just never experience that again?

When I even mention new platonic relationships or crushes to my best friend, she rolls her eyes and is…. Honestly a little patronizing, but I know she means well. 

Any help would be appreciated :)