What are the reasons my bf keeps up with his ex on facebook , including her location?

Hes probably still on good terms with her. I still keep in touch with my exes. I even drop by to say hi once in a while. Just because we didnt work out as partners dont mean we cant still be friends. And with the location part, facebook tells everyones location to everybody automatically. So dont worry, its perfectly normal for people to stay in touch with her exes, and its probably nothing.