However, this site might be just as good as using Google to find out information about him.
If you input his name into the Google search engine, you should be able to see what social media belongs to on Facebook, Twitter, and Instagram.
Women whom he says he went to school with are strangers that he has been talking dirty to It seems you already have your answer that something untoward is happening.
If he is talking dirty to strangers online, then he is up to something deceitful.
At that point, you may as well break up with her and save yourself a lot of wasted money searching for empty truth.