Total faggot. Constantly "injured." Cries constantly. Sizzling hot bod. Tears constantly rolling down his six pack. Will grow up to be a sex-offender. Jerks off multiple times a day. Sucks at baseball. Feels uncomfortable in social situations. Walks like he has a stick up his ass. Loves his hair. Zero social skills. Amazing forearm veins. Sexy-ass tan.
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.