“Is my counselor wrong? Is there anything in the ethics that say the counselor can’t try keeping marriages intact where one party just wants a divorce?”
There’s nothing ethically wrong with it, it’s just not generally how counseling/therapy works. A counselor/therapist might help you come to conclusions and make decisions on your own, but generally won’t give you straight advice or try to convince you one way or another.
Of course, there are different methods, and if your counselor said that’s how he works, then there’s nothing wrong with that.