What to do about my "gf"?

wow where to begin? iv had a really weird feeling tht my gf has been hiding stuff from me for awhile now. this may seem weird but this feeling of her hiding was just to strong i couldnt ignore it. so i installed a keylogger on my laptop. she comes over the other night gets on her email and what not after she leaves i get her email and p/w and get on her email. well i found an email to her supposed ex husband (who she told me she divorced more than a year ago) saying something about a coupon for some place and at the end it said "love you babe" and this email it said was sent march 24th 2009. less than a month ago and her and i have been together since jan. i find a bunch of other emails w her resume where she uses his last name where she told me she changed it back to her maiden name had an adress on there and i find there postings for craigslist where i guess they are tryin to sell a truck they have. it has im guessing his phone number on it. they have a 2 year old kid together. i spoke to her mom last week on the phone and she brings their child around me and we get along great. she tells me she dosnt even want her "ex" husband to know she still lives in town. supposedly she hasnt even spoken to him in a long time. and some how a couple weeks ago i just randomly get chlamydia. and shes the only person iv had w prolly in the past 6 months. how would i go about finding out if they are still married??? just call him and ask if this is her husband?? and if they are do i tell him his wife is cheating and risk having their kid growing up in a broken home like i had to????