Look - he's just feeling really guilty right now, okay?
Quote: I said yes that he was to blame for what he did, but we are both at fault for what happened to get us to that point.
You handled this EXACTLY right. Two stars for you.
Now - your job right now is to be his beacon of light - because right now he's in a very dark place (self-loathing, depression, guilt - all of it). Be clear with him that those loving feelings CAN come back - he fell in love with you once, it can happen again. (He may argue against this, but he'll remember you said it).
Don't mention OW AT ALL for the next two weeks. Stay out of relationship talks - unless he pins you to the wall and forces one on you. Validate, validate, validate. Read Divorce Remedy IMMEDIATELY. Work like mad on yourself for the next ten days - I know it's hard when you just had a baby, but pretend you're on "What Not To Wear" and get some new clothes, new hairstyle, new attitude. And if housekeeping is an issue, get some help in so when he comes home, the house is clean and warm and welcoming.
Send him funny light text messages.
Act As If you are in a good mood and things are going to be okay.
Read the beginning of my thread in the Piecing forum - Valentine's Day Massacre - I summarize a lot of what worked for me.