What should i do about her?

my daughters mother and me fight alot cuz she iz 70 miles away from me but when we r around each other we r amazing 2getha in a way i aint neva been wid any otha girl in my life an i really want this to work but us fighting all the tym i dont think itz gonna what should we do? and and im scared ta death tht she iz cheatin on me cuz when we get into a fight she will tell me shyt bout when we waz brokin up an she waz datin anotha dude now she told me when we got back 2getha tht she didnt do nothin with but when she gets mad at me she will say that she did but then when we stop fighting she will tell me tht she only said tht to piss me off and she does it all the tym lyk the last tym we fought she told me "yea i had with him and if i had the chance to do it again i would" am i wrong for thinking tht she is cheating on me cuz she makes me feel lyk im stupid for even thinkin it and i dont feel lyk i can trust her when im not around her cuz she lies to me so much usually about dumb things but if she would lie to me about dumb stuff why not important things 2 right? am i wrong for feelin lyk dis?