I think you said it best when you said he was the opposite of your H. That's another common theme for rebounds. If I can get philosophical here- the rebound R was put in your life for a reason and to teach you something; can you tell what that is? Maybe it was so that you could remember what it's like to bond with someone. Maybe it was to really drive home that YOU need some time to heal from the damage your H did to the marriage and that healing time probably shouldn't include a romantic relationship.
You CAN get thru this. It sounds to me like there is work to be done on YOU and then later, your marriage. If your H is starting to come out of the fog, you don't want to be all tied up with some other man.
Good luck tonight
Me-43 H-46 M 12 yrs 7/09 T 15 2 grown kids bomb 7/05/07 H moved out 8/04/07 11/22/09 told him I quit;let's get ball rolling Mid Dec- he isn't sure he wants D End 2/2010-Starting to consider piecing