Is this a Bipolar thing - the immediate jumping to conclusions and thoughts of worst case scenarios?

For me this usually involves people and has affected and nearly ruined relationships. It could be a simple let down and I quickly come to the idea the individual is doing me a great deal of wrong intensionally. Or it could be a difficult situation that I blow out of proportion. Yesterday it was an honest mistake of a best friend and my immediate thinking they did something to me on purpose nearly ended the relationship. Yesterday and this morning it was a situation involving the post office. Longer story but I came to the worst of conclusions.

In both cases I am left feeling humiliated.