She definitely will be upset that you are home......she can't continue her affair as easily as she'd like. Absolutely DO NOT live with someone else. Make this HER choice, not yours. Making it her choice helps her see this realistically.
When (if) you confront her, do it with LOVE. Do not yell at her (she will egg you on), do not participate in an argument (have a statement ready, "I love you too much to argue with you. I'm trying to save our marriage.", walk away if you need to, give her time to think, do not look at her like you believe the nonsense but instead look at her like you know what she has been doing and do not like it but you are willing to work through it if she is, and during all of this, do your 360. Be the best man you can be. Look good, smell good, go out with friends,look happy (this is HER choice), show her that she is crazy to lose you.