my wife who i am now separated from claims shes filed for a divorce about 6 months ago, but i have not received any divorce papers in the mail???

my wife claim she wants a divorce because i want change for her and claims she was doing everything...we had a big argument while on vacation in florida, and every since that day she has been talking to a guy friend....and been talking about moving...well months later she begin moving her stuff out and then asked me where i was going?? i had no place to go so i moved back home...a month later she filed for a divorce...a couple months later after that i find out on facebook that my wife was actually dating the guy friend in which i had said she started talking to once back from vacation in florida in which we had a big argument, which was over her saying that i need to change....in other words, she was still legally married to me and was in another relationship and was sleeping with him, which is adultery...this put the icing on the cake for us no matter what and because everything else led me to believe she must of been stopped loving me long ago...