I'm so sorry you're hurting.
I'm not sure of your situation but mine had no hope of R, so when he moved out I put all the cards, love notes etc in a folder labeled "lies you told" and packed it with the rest of his stuff. I knew I would torture myself with that stuff if I kept it. If you don't feel able to get rid of those things, pack them up and give them to a friend for safekeeping, so you won't torture yourself when you're having those down moments.
Of course you still love him. Because your love was real. It was sincere and your whole heart was in it. The wedding songs hurt because you meant your vows, even though he didn't. I felt the same way. Finally I had to realize that the man I thought I married, the man I loved with all my heart, simply didn't exist.
Sending you strength and courage. Hang in there.
Me: Enjoying life
Him: Someone else's problem
Life shrinks or expands in proportion to one's courage. ~ Anais Nin