I'm sorry you're here but at this point you have ABSOLUTELY NOTHING to work with, but of course you know this (hopefully).
I feel if I can’t fight this alone. Giving her space, not talking about it, not trying to reconcile as a couple. It just feels like a waiting game until divorce is filed.
Any tips on how to move on?
At this point you're the one keeping it a waiting game, she's obviously not waiting on you while she openly dates her boyfriend, the "giving her space" is just a very typical excuse for more time to testdrive her AP while you're "plan B" at best (maybe not even that), by the very young age of your daughter, it sounds like you haven't been married that long (not that that should matter much in your situation), life typically gets more complicated, please file for D and end this farce, you deserve so much better than an unrepentant proven cheater and liar, don't forget to get tested for STDs (yes she was also playing russian roulette with your health behind your back).
I'm sorry if the advice may be harsh at times but I can assure you it's well intended, keep posting frequently, the collective wisdom of SI can help you go through this difficult situation, we've literally seen it play out THOUSANDS of times here and in other forums, the only thing unique about your situation is that it happened to you, every case is different but cheaters typically follow a similar script.