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I see some serious issues here. It could very well have been just some loser guy she can't get rid of, but I think you need to ditch her for the following reasons. (note that I always like to included numbered lists in my OOT posts):

(1) You clearly don't trust her already. Either things have come up in the past, or in general she's just a sketchy person.

(2) Her reaction to the situation almost absolutely means she's guilty of some kind of shennanigans.

(3) The worst part of it all is the communication factor. Poor communication combined with suspicion is a terrible combination for a relationship. It's the reason I stopped seeing the last girl I was hooking up with. If nothing else, you should seriously consider leaving her for this reason alone.

Sorry to hear a kid's involved, but I already don't trust this b*tch.

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This is a pretty sad situation and although you handled it pretty poorly in getting upset, yelling and trying to kick the door down (wtf??) you had good reasons and what's most troubling is her reaction. Why didn't she try to defend/explain herself? Is this mostly bc you usually fly into a range and don't listen? It certainly seems like this could very well be the case and that this sort of stuff has happened before but in different situations. If that is true, then the chances of her seeking another dude out who "understands" her makes sense. And from what you are telling us I'm about 90% sure something was going on with this guy and her.

Storming out of the house the way you did doesn't leave you or her many alternatives now either. First you need to figure out if part of her reaction is your behavior in the past. If it's not, then she's probably been cheating on you. Still, you have a daughter with this woman and are engaged shouldn't you at least hear her side of the story before jumping to conclusions??