This is very confusing and I feel so guilty. I met my fiancé 9 years ago and we had a extremely difficult relationship. We had many differences and I was not completely happy. We were living together for 2 years and in 2007 we separated. This caused me many issues to the point I am drinking medicine for depression and going to therapy for the past 2 years. Right After I separated from my fiancé, I started dating an old friend of mine for the past 2 years. 6 months ago, I broke up with him and came back with my fiancé because I could not stop thinking about my fiancé. NOW, there is not one day I don't think about my ex and miss him. What can I do to learn how to let go?

So you date one guy and then part ways, you start to miss him, you date a new guy, break up with said new guy, get back with the first guy, and then the cycle repeats.. .

My advice is stay single for a while (a year at the very least) and sort yourself out. Jumping from relationship to relationship can lead to complications like an infinite loop.

That is how I feel. Its like I can't let go of either! On top of that I suffer from depression and drinking medication, which makes it harder for me to stay alone.

A couple of things - first, your post is in the wrong place. Issues and causes isn't for personal matters, but rather for people who want to discuss political issues and causes, so please put this in the relationships section.

Then you have the issue of "drinking medication". I don't know of any antidepressant medication that is liquid. Are you drinking alcohol... is this your way of saying you are an alcoholic? If not, what are you taking? You need to go get treatment for what sounds like an addictive behavior and depression. You will not find happiness with anyone else until you address this issue for yourself.

Stop dating both of these guys - stop dating, period. Focus on yourself.