I have been in a similar situation as you, but on the other side so to speak. I was the one that "damaged" the trust. First hand experience has taught me that once the damage is done, its done. He said he has forgiven me, but it took him almost a year to express that. Three months after he said that, I still get the feeling that he still holds suspicions and the trust is still a long ways away from mending.
Even though a year and a half have past, and I have learned many lessons from my one account, we still have those "tense moments" about the biggest mistake I ever made. One thing has come to be a positive out of the situation between my husband and I- our lines of communication have become very open and brutally honest. We do not hold anything from each other any more! We are more open towards each other now compared to three years ago, even all the way back to the day we were married.
I felt I destroyed everything between us, so I consciously made the effort to open up more and express myself more on what I thought, felt, do during my days, my a-ha moments, everything! I was desperate. I didn't really want to loose him, I just made a thoughtless mistake. I do feel we have come a long way from where we were, thanks to open lines of communication. But I can tell some things aren't "right" with us.
Even though this is just my story, and I do believe that communication is the key to restoring trust in conjunction with time, something probably never will feel the way it used to be. It has just shifted. I don't know if this post will help any at all. But another, way to look at it is, "does he show genuinity?", "does he seem or act really scared at times about loosing me?", "does he think about me when doing or saying thigs, and making choices?" These were the things that were actively going through my head and I was expressing in ways other than words. I seemed all of a sudden to appreciate him more, and scared to death of loosing him.
I hope this helps in some way, maybe by looking at it in another perspective. what ever had happened, I am so sorry for your loss. I know it hurts, I could see it in my husbands eyes, and it made me sick.
Best of Luck to you, Dear!