That gave me pause because I just ended a relationship with an emotionally secure partner (the prof) with whom I lacked "chemistry." I also recognize the unhealthy codependency of my MR. Am I only seeking unhealthy relationships?
I doubt it, you seem pretty grounded. More than likely you're just not quite ready for a new R yet. When I started dating again I wrestled with a lot of conflicting feelings about it. It just didn't "feel right" at first. If you had asked me back then I probably would have said the same thing about there not being "chemistry", but now looking back I think my walls were still up quite high and that was preventing any chemistry from forming. I think after some more dating and some more time you'll start adjusting like I did.