When someone borrows as something from you and comes back to get repaid for what they borrowed.
I loaned Bob $20 bucks and the next week he was pulling a roundtree ( borrowing then saying it was them that gave it to you) and tried so say I owed him.
Someone who jumps from one relationship immediately into another one.
Serial monogamists can not stand to be alone and often suffer from vast commitment and insecurity issues.
Because they jump into relationships immediately after the previous one has ended, serial monogamists typically don't take the time to reflect on their behavior or why their previous relationships failed; thus, they end up making the same relationship mistakes over and over again.
Person 1: Damn, Dustin already has a new girlfriend?! It's only been two weeks since he broke up with his fiance! I think he's a sociopath.