I don't think I've ever been in that situation, but one thing I sign on cards for people about to get married is "Never forget the reason you two fell in love."
When I was a teen, I was a hopeless romantic. I remember feeling so much love for someone and seeing those feelings expressed in movies or real-life documentaries...and I wondered what happens to make people fall out of love. Like how does it all go wrong. And I remember that's when the message I write for people came to me: "If people held onto the moments that meant the world to them...and never let those go, perhaps they'd never stop feeling the love they felt at those moments. Perhaps those memories would rekindle a love that was fading."
Of course, I don't know if it works, but it'd be something I'd try before throwing in the towel.
If you ask a lot of people with successful relationships how they make it work, what a lot of them will say is they CHOSE to love that person. It was something they worked at instead of just waiting for the feelings to be the controlling factor. Coz there will be times you will get so angry, that the last thing you think you want to feel for that person is love. But love is a powerful thing. It is the thing that leads a mother to still feel love for a child who killed her husband. She could be so mad and want to have nothing to do with that child that robbed her of the love of her life...but she'd be shattered if anything happened to that child. Love is patient. Love perseveres.
You mentioned praying... I suggest you keep at it. Pray for him, not you. Stormie Omartian has several books on relationships and in her book "The Power of the Praying Wife" she shares how she was so mad at her hubby and "that quiet voice from above" told her to pray for him. She argued with God that it was she who needed prayer coz he's the one in the wrong. But that prodding little voice wouldn't quit so she did. Her prayer shocked me when I got to the part where she said, "God give my husband a new wife..." until I read the end of the line where she said, "...and let it be me."
Anyway, one of the things she shares is selfless praying for your hubby...his happiness, success at work, his health...and how doing that really changes your relationship and somehow brings you both to the same page where you really get along. I don't know if that's what will happen with your guy, but perhaps praying will help you get direction on what to do.
Wish you happiness, Sweetie.