Wt shld b dn do whn 2 pepl realize tht thr is no future fr thr relatnship,but still cant live wthout eachother

career is the most important thing in life, and when u realize that u r so deeply involved in a relationship that u cant focus on ur career, ur life is going nowhere, and for the sake of such a relationship which has no future at all............what should be done? even after trying to break up the realtion ship for N number of times, landing up with only tears and miserable mood which again eventually affects the work very badly...........how to come out of such a complication of life????