When someone gets caught doing something morally reprehensible, and found to be completely and utterly in the wrong, I've seen that they tend to react in one of three ways:

1. Try to moralize it away - "I've done nothing wrong since we're only married in paper"
2. Attack and badger YOU to try to get the spotlight off of themselves. (your sitch)
3. Go full hell-on-wheels and just embrace it

#2 sounds like what's happening to you; take a deep breath, go somewhere and walk around and scream if you have to. Remember that this is "normal" behavior.