Stopping Clopidogrel?

I had 3 coronary stents placed in 2005. During this procedure a 4th stent was stuck and I suffered a heart attack. I have been on Clopidogrel 75mg daily ever since. I left my original Cardiologist because I no longer trusted him. The Cardiologist I have been with for 5yrs. now is starting to concern me (I just found out he is on staff with the original Cardiologist). He just told me he wants me to stop taking my Clopidrogrel, no explanation as to why? I am 77 yrs old and up until this incident I had never been hospitalized or sick. I kept my self in good shape.