Ladies who've divorced and remarried, I have question??

Ok so how did you know your current husband is the one? How did you know that it won't end up in divorce like your first marriage! Obviously at one point you loved your first husband and then with your 2nd husband you go through the same thing in the beginning as you did with your first husband in the beginning, I mean younlovednyourbfirst husband enough you marry him! How do you have the confidence to know now that this 2nd guy is the one! I'm asking becuase when my husband and I were dating, got engaged and got married i never had any doubt, I was totally sure he was going to be my lifetime love, that I would never divorce him, or even if I felt the need to consider to divorce him I would remember all the great times we had and how we were when we were dating and realize it's not worth throwing away, but in truly thinking we need to divorce, I'm just not happy with him, iv just kind of fallen out of love, I know he does not feel the same way and is completely oblivious about how you feel but I'm just worried about the what if! What if we are meant to be, I don't want to break up and realize I was wrong. I feel like I'm in sicky ansticky situation, i just feel generally irradiated by him on a constant basis, i don't miss him that much when I go to the UK to visit my family, I can't stand having sex with him. We got together young (16) and married at 20, as we've grown up we've grown into different people and neither of us just aren't the same anymore - we are 22 and I think if I were to meet him now and get to know him I wouldn't be interested in dating him. I'm really scared to leave firstly becuase of the comfort, not only is he the only man I've been with and am used to but he's like the largest portion of my life and nervous for the change and I'm still worried about the what if! I just don't know what to do that's why I wanted divorced ladies input. 
Also I know that you ladies out there who got divorced becuase husband cheated isnanconoortley different ball game and I also want to point out he is not at all abusive, nor is it a terrible horrible relationship, we've just grown in different ways.