What do you do when you are in a 11 mth. relationship and youre inlove but you also have feelings for your ex

I just got out of a similar situation. I wasn't in an 11 mo. relationship with the guy, but I did realize that I still had feelings for my ex. Once I realized this (and as hard as it was) I sat down with my current bf and we had a talk. I told him the truth and he respected me for that. One thing I have learned is that communication is the key to any relationship - whether it just be a friendship or a bf/gf, etc. What I realized in my situation was that it was not fair to my current bf for me to still have feelings for my ex. If I am in a relationship, I want to be able to know that I can give that person 100%. And vise versa. So, be honest in telling your significant other. It's not fair to drag them along if your heart belongs to another. Good Luck!