Is it wrong that I still cry over my ex even though we broke up a year ago?

Question

Ok, my ex and I broke up a year ago and I got this new guy right after we broke up sort of like a rebound and we have been together ever since. I really do love my bf, but I still find myself thinking about my ex. I Still cry over him every once and a while.He was my first love and longest relationship so of course there will always be a place in my heart for him. Well this just made it even more hard for me because today my ex called me. I didn't answer it because I was in complete shock and I didn't know what to do so I let it go to voice mail. He left me a msg asking how my life is going and that he misses me and hopes I'm doing good.  That really upset me for some reason and now i really cant stop thinking about him.I tell myself I'm over him but am i? Does this mean I still have feelings for him?  I almost feel guilty that I'm sitting here crying over an ex when I have a bf that i've been with for a year now. I'm so confused on how I feel. :/