First, you've experienced 2 d-days about 12 months apart. That's trauma on trauma. You're 2-3 months from the 2nd trauma - that's usually a very bad time. You've got an infant and a toddler depending on you. I'm sure you're getting some joy from your kids, but their requirements are so very stressful.
Of course you feel awful.
My reco is to feel the grief, anger, fear, shame, whatever that comes with being betrayed multiple times and let the feelings flow out of your body. That usually takes some alone time, which is very difficult to get with kids, so give yourself time and grace.
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I know it's normal to feel humiliated - but you didn't fail. Your H did. He cheated to avoid resolving his own issues, not because of anything you did or didn't do.
So hold your head high when you go out in your village. Some people will snicker, and they'll regret it if they become BSes. But many people will have sympathy for you because they know you didn't fail - your H did.
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Are you in IC? A good therapist can help.
What sort of support do you have? Emotional support from friends? Practical support for child care and household chores?
Do you know if you really want your H back? Or are you uncertain about R/D? Or do you want to dump your H?
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There are a bunch of 'bull's-eyed' posts at the top of this forum. I urge you to browse them - you may find a lot of help that speaks to yu.
Also, I recommend reading https://survivinginfidelity.com/documents/library/articles/recovery/what-every-ws-needs-to-know/. That article lives in 'The Healing Library', and I recommend browsing there, too.
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Go for healing yourself first. Don't worry about R or D. The healthier you get, the better the outcome will be. No matter what, have some faith in yourself to heal. That will take longer than you want it to take. Progress will probably start very slowly. But you will heal.