Yes, absolutely, have faith in yourself to heal from this trauma. You can survive and thrive.
A lot of our character is created when we're children, based on our interpretation of what happened to us and what we see happen around us. The problem is that kids don't have the experience, knowledge, or synthesizing skills that mature adults have.
People change if they replace their childhood conclusions about the world with adult perceptions. That's easily said, but it takes a lot of hard work to do. So WSes can change, if they do the work. That usually requires the help of a good IC.
Watch what your H does. Actions are more important than words. You describe a WS who doesn't want to lose you. What you need, IMO, is a WS who realizes they're hurting themselves by their behavior and decides to change from betrayer to good partner.
Here's some reading I recommend:
http://www.survivinginfidelity.com/healing_library/reconciliation/what-every-wayward-spouse-needs-to-know.asp - if this resonates with you, I suggest printing it off and giving the printout to your H as 'something you found on the web.' My reco: DO NOT tell your H about SI until you're sure he's on board for R.
http://www.survivinginfidelity.com/forums.asp?tid=361740&HL=14993 - serjr threads for newbies
Tactical Primer:
http://www.survivinginfidelity.com/forums.asp?tid=235051
Boundaries and Consequences 101:
http://www.survivinginfidelity.com/forums.asp?tid=385631
Setting Healthy Boundaries:
http://www.survivinginfidelity.com/forums.asp?tid=231851
Before You Say Reconcile:
http://www.survivinginfidelity.com/forums.asp?tid=406548
The Simplified 180:
https://www.survivinginfidelity.com/forums.asp?tid=598080
20/20 Hindsight: What I Wish I'd Done:
http://www.survivinginfidelity.com/forums.asp?tid=161389