I feel somewhat as you do. When I found out, it was supposedly 13 mo. after the end of the A. Yet, it was freshly printed photos of the OW that I found. What a slap in the face!
Be honest with yourself. Did H meet your needs adequately all along? Needs being met is a two-way street. It takes two to make or break a relationship.
I, too, am lost right now. I found out 2 mo. ago, and H is returning to many of the old habits he vowed that he would kick. I hesitate to start any type of conversation now, as I can almost expect some kind of flare up before it ends.
If you are certain that you want your relationship to be recharged, I would suggest reading The Five Love Languages. I believe it is by Chapman.
Please try to take care of yourself. Also, work on you. If you change, it is possible that the relationship will cnage also.