my wife of 19 years tells me she wants a divorce not in love anymore. I suspect more check phone records and she has a man she text and calls

You can possibly claim adultery. It just depends on what you can prove and how you believe it would affect the outcome of the case. There is not always a huge benefit in filing for divorce on grounds of adultery. It might, however, be relevant in distribution of property or other issues. It just depends on the facts of the case and what the issues are.