<human>: So, I'm about 1.5 months out of a 2 year relationship - very hard breakup.  My friend asked me out about 2 weeks ago, we've hung out like a few times since then, and we made out a week ago.  We've kissed two more times after that.  

Initially I was all game for it cuz rebound.  It was so nice to have that companionship, physical contact, and to not be thinking about my ex.  But now that I've got the initial "hookup infatuation" under control, I've realized that I'm not even close to being qualified to be in a relationship with anyone right now and I'm pretty sure that's the direction he wants to go in.  I'm still dealing with my last relationship and I just want to have fun.

He's asked me out for tomorrow and I said yes, but I really just feel like I should tell him where my head is at.  I feel so freakin bad because I know that kissing meant a lot to him, and it meant something to me....but not at the same caliber.  I guess another thing I should mention is that he and I have some history from high school, we always liked each other, but never did anything about it.  This is why I think he's super invested in it, cuz he's been waiting to date me forever.

Can you summarize the given text in a few sentences?
<bot>: Kissed a friend on the rebound, not actually interested, now I feel like an asshole.  How should I proceed?