Why is it so hard to break up with your boyfriend?

Maybe because deep down you don't actually want to. In this case, you have a lot of work to try and make the relationship happy again.

You clearly still have feelings for your partner. Are you sure it can't be worked out together?

If you are a victim of abuse by the hands of your boyfriend, it is because of fear (not love as the majority of domestic abuse victims seem to claim). If this is the case, speak to an authority figure to help you. The sooner the better, deaths by domestic violence is on the rise due to economical strain (recession),