90% of this is truth.gov
you let her know early on. get rid of the background dudes. dont tell me "we just friends" i aint buying it. get rid of ALL background buddies. dont have any more back n forths with past flings, exs, etc. if he hits you up on FB. do not friend him. if you were friends. unfriend him. if he keeps asking why you wont accept his friend invite. dont respond to that either. EVENTUALLY he'll get the hint. it takes some dudes longer then others. i tell him, hey dude will tell you how he messed up when yall use to date/be together, etc. but now he sees the error in his ways. he may not even mention hooking back up again. he just throws that out there to see if he can catch a fish. sure there are the 1 out of a zillion dudes that actually mean that but dont want a relationship with your chick. but we're not talking about those one off scenarios. we're talking usual situations.
once old girl clears her old dudes out. then yall start a relationship. if you find out she's still going back n forth. you end it.
if yall married, exchange passwords to all digital websites, phone voice mails etc. neither party should ever have anything to hide. and occassionally check up on each other. not to satisfy your own crazy self. but to keep them on their toes. cause the way the net is nowadays its way to easy to have a casual convo with your EX. "hey just seeing how you were doing?"
dont worry how i'm doing. dont worry how my current wife is doing. if you're that worried. pray for us and keep it moving.
but at the end of the day, if yall are married. its between your chick and God what she decides to do. and let her know that from the jump. you wont go running around trying to find out. you are holding her accountable and she does the same for you. thats why yall have each others user names/ passwords etc. beyond that. thats all that needs to be done. if you have a stealth chick for a wife. and she gotta it going like that behind the scenes. it is what it is. you share that girl and you dont even know it. so who cares. again thats between her and jesus. let her live with that understanding.
