On the other hand, boys reported engaging in shorter relationship than long lasting relationship. (interpersona.psychopen.eu)
Since then I have had one long and one short relationship = Learning a lot from each one. (privateherpesdating.com)
Some of the general warning signs could be that if someone has only had short relationships throughout their lives and never any long relationships, it could be indicative of having difficulties with intimacy. (relationshipcounselingcenter.net)