I quit

So here's the bald and true - I quit on my novel.  70,000 words into it, I quit. 

I had fantasies about it working for me.  I had every intention of finishing it.  I think I even know how it ends.  But here's the truth:  I'm not in love with it any more.  I've decided that the characters bore me, and I don't believe in the ending anymore. 

Is this the "7 year itch" (or the 70K slump)? 

Is it salvageable?

Is quitting on it reprehensible?

I don't know.  All I know is that it's going in cold storage for awhile until I can decide what to do about it.  And it's a shame, really, because there are some gems in that thar dirt... I just have looked at them and sifted through them too often to be able to have any perspective on how to mine the whole thing out of it whole.

I'm not sure where to go from here, but would love for someone wiser to tell me.