How important is chemistry in a relationship? Can a little be ignited into something bigger...?

and what works for one person, may not work at all for someone else. That being said, I will offer my opinion, only because you asked, but I will not feel bad if you don't take any of what I say to heart! I think that your "ex" is being both cruel AND manipulative. If he told you that "he wasn't certain of his love..." and now that you've moved on with someone else, is attempting to come back into your life, it is probably because either he realized how much he really DID love you or possibly found that the other women he has encountered did hot have those qualities he originally found endearing in you or he's simply jealous of the fact that you have found somebody else to love & that new person loves you too! THIS IS HIS PROBLEM, NOT YOURS! One of my best friends has a saying which goes something like this..."relationships are like busses, wait a minute or two & another one will come around" If you are truly happy with the current person you're with, then you owe it to both yourself and that other person to LEAVE your ex as just that, an ex! Keep in mind that if he fed you that same line about "uncertainty" not only once, but also a second time, what's to stop him from breaking your heart yet a third time? As far as the "longing" for your him goes, that's something which will fade in time, but you need to take some responsibility and some steps to help it along...such as deleting his phone number from your speed dial list, deleting all of the emails he has sent you, deleting his email address, deleting all pictures and/or videos of the two of you and finally, blocking his email address. While I know that these things may seem somewhat radical and difficult to do, it is really the best thing you can do for yourself and your burgeoning, new relationship. I am far from being any sort of relationship expert and as I said, this is purely MY own opinion, but I base my statements on personal experiences, having had my heart broken and being in a couple of rather disappointing relationships in the past few years. I will leave you with a couple of final thoughts...it is my opinion that you should not allow your previous bad experiences to cloud your judgment and you should do everything you can to stay optimistic about your current romantic situation! Best & much love, -Steve