How to mend a broken heart?

It has been a really long time now. Few months, maybe even years. Who knows. I lost count long time ago. At times I just feel that everything was wrong. That so many things happened that kept breaking apart. I tried to fix and glue it back together, and then, after a while, everything just fell and shattered to many pieces. Too many that nothing can put it back together.
At times I think that when everything shatters, the heart shatters as well.
What I mean is that I can’t force my self to like the idea of someone else in my life. I try to even just think of it as fun, but I can’t. I think I completely lost every emotion that has to do with loving someone again. Is it fear? At times I think it is fear of rejection again. Fear of wasting my time and life again. It is enough I wasted all these years, and now all I can do is nothing really. I am just living day after day. Nothing to look forward to. Nothing at all.
I have changed so much. Really a lot. I changed physically, mentally, and emotionally. I have become a person trapped in that distorted mirror. I keep looking at it and it changes the second I look at another place in that mirror. Nothing is staying put. Nothing is going as I have planned. That’s why I never plan anymore. I never look forward to anything anymore. I just don’t have the desire to do anything at all anymore.
I used to be really nice and very innocent. I lived life simply and just acted like everyone else. However, I kept getting pushed, and pushed till I no longer controlled my anger and emotions. I used to be really nice. I used to be a very different person. A person I want to be again and just think life is simple and just think that everything will be fine if I really thought it would be.
At times, without even thinking at all, I act the way I was without realizing it. I suddenly become nice, and compassionate to others with no reason. Sometimes I do feel that I am bipolar and I act as two different persons. I don’t even realize it at times, but I am trying a new thing. When I am mad and angry to not say a word. Just keep my mouth shut and accept anything and ignore it too. I can’t change anything or anyone. I cannot control anything but my self. I just have to accept life and just live day by day and maybe .. well no maybes. Seriously, how do you mend a broken heart?
It is that time of year that I dread again. Every where I go, even sites I stumble are all about Valentines. Oh Valentine this, buy this for your valentine. Blah blah blaaaaaah..
My sister and I go to the gym about 5 times a week. So one night, there were lots of people in the class. (Mostly middle aged women.) The number of coats on the hanger are obviously a lot, and the odds of someone having a similar jacket to yours is high too. As we were leaving, I grabbed my jacket and my sister’s jacket. We got into the car, and my sister tried to put it on and then says, “Mona? This is not my jacket.” My jaw dropped. I said, “oh no! You sure?” She said, “YES!” So we stopped the car and went back in. My sister was carrying the jacket and looked for hers.