Is this a "Rebound" relationship?

Tonight is my second date with Jen.  Jen will be getting a room and the two of us will be spending the night together.  This will be the third time in as many weeks that we have been able to see each other.  We met at a party on one week, we went out on a date the next week, and now we will be spending the night together.  When we haven’t been physically together, we communicate a lot – e-mails, text messages, IM conversations, and even Facebook and Fetlife postings. 

Let’s not forget that the party where I met her was literally one month after Leah had moved out.  Does that make this a “rebound” relationship?  Of course it is, although I would point out that waiting a whole month before starting a new relationship is actually pretty good for me. 

So what is the problem with “rebound” relationships?  Is it that I’m not “over” the other person?  So, am I “over” Leah?  What exactly does that mean? 

Leah might have an “on/off” switch that shut down her feelings for me.  I don’t actually know.  I know that I don’t have something like that.  At times, I wish I did.  What I do have is a brain that zips back in time and goes through memories in hyper-detail, coming up with tons of connections and patterns.  With Leah’s behavior the last few months together and the last week together, followed by the fact that I realized that I was not feeling a huge gaping emptiness with her departure . . . I took the time to look back at our relationship.  With her not there to manipulate me 24/7, I saw patterns, and I realized things about our relationship.  Things started making sense.  I might not be “over” her, but I most certainly don’t want her back. 

It seems to me, then, that there is more to the danger of “rebound” relationships.  It seems to me that a big danger is defining the person in terms of the “ex”: she has these characteristics that are the same as my ex, but she has these other characteristics that are quite different.  I know I did some of this: Jen is older than Leah; Jen has an established career and lives on her own.  The key, though, is that Jen is her own person.  I believe I appreciate her as herself, and not as “someone that is very different from Leah”.  This is something time will tell, however. 

My last “rebound” relationship was Leah.  Where other women knew to avoid someone that had just come off a nasty breakup, Leah did the exact opposite: she actually pressured me to date her.  Leah defined herself as “not the woman with whom I had broken up”.  The irony, I realize now that we are apart, is that she had a LOT in common with her (for example, both of them were willing to say or do anything in order to convince me to let her move in).  One thing she did not have in common with my previous lover is passion.  I went from a very passionate relationship to one with no passion at all.  And, in true “rebound” fashion, I reasoned that “perhaps the lack of passion is what I needed”. 

Can I say that it’s different with Jen?  Did a whole month apart, realizing what a mess my relationship with Leah had been, “fix” things in my head and my heart?  Is the fact that Jen and I are taking things slowly (we won’t even call each other boyfriend/girlfriend yet) making the difference?  I could answer these questions, but . . . these are things that must be answered later, when looking back at this time.  And, hopefully, she and I will be looking back at this time together.