Cory, please just do research on vaccine safety. They are well-studied, safe for the majority of the population, and protect those who cannot get immunized due to other chronic conditions such as cancer, autoimmune disease, HIV/AIDS, and weakened immune systems.
There have been no studies linking vaccine to autism in any way.
I am a nurse who made sure my son was vaccinated; his father didn't care one way or another.
However, I had seen the effects of German measles on a child infected in utereo. He was blind, deaf, and mentally handicapped to the level of a one year old child. FOR THE REST OF HIS LIFE. His mother was infected by a child who had not been vaccinated, and she had never had the disease either.
Your ex may have gotten correct information. The sites recommended on this post are credible medical sites. Vaccines generally are free to low cost, covering the actual injection supplies and personnel who are administering the vaccine. You cannot make an informed decision based on poor information. You need accurate info before you decide which side of the fence you belong.