I’m sorry you’re going through this OP 
I too managed to get past DH’s infidelity, which happened a little over five years ago.
For the first year at least, things were hell. I felt as though I could never trust him again and that he would certainly cheat again. I hated him and seriously considered leaving several times.
But he truly grovelled.
What saved our marriage was his willingness to be transparent in every sense, ie. I had full control of his finances, his phone, emails, absolutely anything you can think of. It was impossible for him to cheat even if he wanted to because he insisted on never going anywhere without me. He was desperate to rebuild trust and even suggested I put a tracking device or some kind of recording device on him for when he went to work! I never felt the need to go that far, but the fact that he was entirely open with everything was the best thing he could have done. He spent months never going anywhere but work, where he said I was free to call him on his landline whenever I wanted, and I often did, so that was a huge sign to me that he was truly remorseful.
Now we are in a very happy place. I hardly ever think back to those times. He is trustworthy, seriously regrets his past disgusting behaviour and I don’t feel the need to call him at work or to worry if he goes out without me, (which he still rarely does!)
The fact that I can honestly say I trust him again should give you some hope OP.
Hang in there, and if it doesn’t work then you’ll never feel bad for not trying.