Oh come on someone please tell me how you would break up a serious relationship?

Ok so im a little obsessed and determined to get this guy and save him from this dum bottle blonde bar girl, and yes im a tad bit jealous, but hey atleast im honest. now again how would you break up a relationship that was serious after only 2months, now keep in that this chick did just get out of a relationship before she meet him...a freakin 3yr old relationship at that!