I had reconstructive acl surgery using a cadaver tendon less than a year ago and recently found out I tore my acl on my other knee. Then the knee I had surgery on started to bother me and its painful especially when bending. I am concerned I reinjured my acl on the knee that was operated on, how possible is this and what should I do?

It's common for the knee that's hurting to mean you put all the work on the other one, and then that one hurts to.
BUT I'm not saying that's what's happening to you. Only your orthopedist can say.