<human>: Can you succinctly summarize the text in 1-3 sentences?

I've dated a girl for about 9 months now, and she has a lot of great qualities.  And a few not so great ones.  But overall, she's a really nice girl with minimal baggage and she's very good to me.

The problem is, I don't love her.  She's told me she loves me several times and I can't bring myself to tell her back.  So, I can't figure out if it's because I still love my ex-wife, or if this current girlfriend is simply not the one, and therefore she can't make me quit loving my ex-wife.

I'm sort of convinced that if I find the right one, then my feelings for my ex will go away and be replaced with love for this new girl.  This is kind of a general thought, any opinions from the peanut gallery?
<bot>: Can't figure out if I'm hung up on my ex and ruining my current relationship, or if my current relationship just isn't the one.