Speed relationshippin

Is when you go thru a relationship with all stages and levels but it only lasts 4-6 weeks. That includes, meeting, first date, first sex, going out for dinner, bike rides etc . And all of a sudden the end is coming with arguments which leads into 'we need a break' forever. My roomate did that already twice this year and after celebrating New Years together with His GF, it was over without any particular reason.
Its sort of like Speed Dating but lasts longer.