I'm on crestor (rosuvastatin), (rosuvastatin) and now my cholesterol is really good. can i stop the crestor (rosuvastatin)?

No : You were placed on it for a reason. Discuss with the prescribing doctor.

Must maintain goal: The longer high LDL levels exist, the more damage occurs in the artery wall. Once on therapy it is important to maintain goal LDL levels (ldl-c < 100 if high risk, otherwise < 130). Ldl particle number (ldl-p) should be checked once at ldl-c goal to judge adequacy of therapy. Talk with your doctor about a trial off medication - if your numbers are not maintained then you will likely need statin.