I'm so sorry you are here but glad you found SI. You are among friends who have all walked your path. You will be ok, and find great support here.
Please check out the Healing library, upper left, yellow box. There's great reading resources there.
Look after yourself first and foremost. Find an I.C. and get the support of family and close friends. You don't have to do anything else in the meantime, or make any decisions. Just take care of yourself.
Keep posting and reading.
Don't put the key to your happiness in someone else's pocket!
The next few days, weeks and months are going to be traumatizing. There's no way around it.
Do the reading - maybe order some books - so you'll know what demands to make and whether your husband is truly remorseful. Lord knows I wished I had found this forum at the beginning of my rollercoaster ride!
Take care of yourself and TRY to realize that, throughout the pain, anger and grief that is to come, that eventually THINGS WILL GET BETTER!
And keep posting here. It's difficult to find people to talk to (a counselor is important, IMO) - but the folks on SI have heard it all and most have great advice!