Confession of the broken heart

I am not happy these few days, PMS that is. Been busy with work, been sleeping a lot less, and I feel tired all the times. I have also been doing some thinking for now. And yes, I think I have problems dealing with my own feelings, and emotions. It is difficult to put in words how I feel but I'll try.  You see, I noticed that everytime if I ever feel that I am involving myself into a relationship more serious than just friendship, when I start to have feelings of more than just friends, I will take a step back. I think this thing happen at least 5 times now with different persons after my breakup last year. I don't know if it's because I was hurt so deeply before and now I do not want to expose myself again the same way, then subconsciously, I developed a self defense mechanism within me.  You can say that maybe I'd lost faith in relationship, I don't know. All I know is that I do not want to be hurt, do not want to feel pain again. Many times, I don't see myself loving anyone else new. It's not because I don't believe in love anymore, I still, but I have become cautious. Maybe too cautious, and maybe it will hurt me one day? And hurt many other sincere hearts around. I am sorry. I truly am, for those who cares.