In Love With My Ex Still

Its been close to two years that we've been split up and we were married. He left me for another woman, I tried fighting for him. We were married for 2 years together for 3. I have been dating my current boyfriend/fiance for about 13 months. I still find myself in love with my ex even though he treated me wrong. I can't seem to get over him, I can't seem to stop loving him,I honestly want him back. Him and his girlfriend are still together and I will never be a homewrecker, even though she did that to me. Sometimes I just want to ask him what happened. I love my fiance now and he is perfect and amazing, everything I've ever wanted. I can no longer be in this relationship with my current boyfriend because I know he deserves better. Please don't bash me, I am looking for advice. Also I'm 26, my ex and I tried having kids but lost 2 pregnancies one at 9 week's and the other at a little over 6 weeks. Please give me advice, I'm losing it and ready to just end it all. Every since we've been separated I've been depressed, my weight is up and down, hair falling out, just horrible. My current bf has been here for me and tried to save me, he loves me so much and fights for me. I know I'm selfish and foolish. Advice please!!