She blocked you on FB because she needs to feel she can control something and that she can. If she does have BPD chances are she will try to recycle you at some point. She already has tried to. Up till now those attempts have failed because you blocked her but someone posted on this board a BPD ex contacted for a recycle after 26 years so you never know.
Yes she did love you. PwBPD love you so much it hurts. Every time they fall in love it feels like that. Because whomever they fall for feels like THE ONE. The one who will end their pain, the one who will make them whole. Until they suddenly don't love you anymore or find out you are not THE ONE. Because you cannot read their mind, feel what they need, understand what they want, want what they want, etcetera.
To prevent ending up in a toxic relationship next time, look out for the

of speed.
A girl that breaks up with a guy and goes after you within 2 days is a major

It means she can't be alone.
A girl that sleeps with you within 2 days is a major

. It means she has either fallen in love with you too fast (very BPD) or doesn't respect herself (very PD) or puts too much emphasis on sex (very BPD).