Ok, not a male perspective, but obviously I can't know anything for sure -- I'm not there, but I would hope that he confessed this to you for the reasons he says he is.
If, in fact, he is confessing b/c he wants to have everything out in the open and he wants to now rebuild your M, you have a decision to make.
I honestly believe the trust will come back in time. Not right away, but if you truly love your H and want to stay married to him, you will be able to work through this, I think.
As horrible as it is, it may actually be a good thing (kind of like actually separating before you can "get back together"). He is finally deciding he needs to quit all his "shenanigans" (as my H called his) and wants to be honest w/ you and get on w/ rebuilding.
Do you believe him when he says that he truly loves you? If you can answer this "yes," I think you have your answer for right now. The rest will have to come in time.
Me: 38 H: 35 S4, S5, S10 Bomb 01/07 Wanted D - nothing would change his mind Numerous A's prior to D bomb; EA prior/during D bomb Piecing 04/07 Deployed for a year 05/07 Still Piecing 2010 M 11 yrs 05/10