Hmm, I'm going to need to toss a coin here to see which kind of situation this is ...classic rebound? ...or classic "nice guy comes in last"?

This is going to be harsh, Joey, but for whatever reason, she doesn't need/want you anymore ...either you've served your purpose and helped her deal with a previous relationship, or you placed her on a pedestal and she lost respect for you. It would probably benefit you to figure out which and avoid it in the future, but my advice is the same ...

Let her go, Joey ...cut her loose, close the door, sink her battleship ...put whatever metaphor on it you want, but do it. If you don't, you are going to be susceptible to her using you again ...when the new thing doesn't work out, anytime she needs an ego-boost, etc. ...and you don't want to ride that rollercoaster, trust me.

I know you won't listen, but by-gosh, I gotta try ...