Ohhh I can relate to this one! Last year an ex left me, I was devastated. Cried for a few days non stop, couldn't eat and just generally didn't want to live anymore.

Then it passed. I do think this is a bpd trait. Also can happen to anyone really, once you're away from the person and the initial shock has passed, you realise that you weren't that happy or that the relationship wasn't right. It's just more pronounced in us BPD'ers.