I need a lil advice please(heartbroke)?

me and my fiance been havin serious problems since i caught her sexting some dude im march..she apologized and swore no actual sex happened and i spoke to dude and ended there fun and games..ofcourse i keep bringin it up which is driving her crazy as i still have soo many questions however now were dealing with serious trust issues and im hurt so bad im jus insecure now..we been together 7 yrs and have a 2yr old son...i planned on marrying her soon but not sounding like a good idea at this point shes tired of me bringin it up and im tired of thinkin about it..tonight i brought up the future and how i dont wanna go thru that again if we continue..which led to a lil arguing and now shes suggesting maybe taking a break(not sure what that means)from this constant war of words..it starts off good then the convo. goes back to why she did that b.s. to me while tellin me she loves me everyday(bogus) anyway i do believes she cares for me and i am her sons father however what should we do..i feel like im the one who has been tryna put this mess back together after she almost ruined it completely..do i jus leave her or do i give her space?