Unity using too much memory on mac

Unity suddenly is using too much ram w$$anonymous$$le i am working, in the attached link you can see the profiler is indicating 300 used memory, as well in the activity monitor but as soon as i close unity there is more than 1.5 Gb drop. T$$anonymous$$s is becoming so tedious because if i kept working for 30 mins without closing the application the ram becomes full and A message asks me to close some applications to free the memory Again. P.s. I am having t$$anonymous$$s problem for a week now I even formatted my mac because i thought the problem didn't have do anyt$$anonymous$$ng with unity. http://imgur.com/a/PdzIV