Divorced ladies, I need your help!

How did you do it? How did you finally muster up the strength to call it quits with your husband. 
I have only been married for 3 years but it is evident that my husband wants to be with his ex. He has been lying and hiding stuff from me. I am tired of it. I want to leave so badly but I am so scared of getting a divorce.  
My older brother got a divorce and it tore my parents up!!! They were so upset and didn't know what to do. I don't want to do that to my family again!!! 
I need to leave. I just can't find the strength to do it