I need relationship help my fiance told me she cheated on me.

Okay so my fiance (33 f) and I (32 m) have been fighting like crazy over every little thing. When she gets mad she has no filter and ever argues in front of our 5 year old daughter. I usually try to tell her let's not argue in front of her but once she sees red its over.

So just this past Friday we were arguing over another fight we had she blames me for everything even tho 99% of the time its her attitude. So we were arguing and she told me she cheated on me and she took our kids over to the guys house she also claimed it was somebody I know. This also isn't the first time we've argued and she says she cheated but I'm not going to lie this time it hurt me and broke me so I just got up and left went out got drunk (probably not the smartest thing) . After I left she was blowing up my phone saying she lied but idk what to believe it really hurt me and this time she gave more details so I also got home after being out drinking and she Came out to the living room trying to apologize with sex but I still feel like she cheated I even had a dream that same night about her cheating. So I'm stuck in don't know what to do we have 2 kids but we fight like crazy there is no respect in our relationship.

I dont know what to do should I move on ? Trying to talk it out is just her blaming me for everything. I really don't know what to do but it sucks seeing my oldest daughter see all this she is 5 my youngest is only 8 months but I'm tired of always arguing and fighting. She also threatens me with never seeing my girls or child support which I want to see my kids everyday so idk how that's going to work.

I just don't know what to do i feel helpless and lost do I just stay for the kids like I've been doing or do I go thru this battle that will get worse if I tell her I want to leave her.

Please any advice will help thank you in advance