Hello ranger,

If you have feelings for her, and the relationship then I suggest you tell her. Rather than ending it because it is all too hard but say that you just don't want to cause her any more anguish. I can understand where you're coming from but how about you take the bull by the horns and tackle it? This relationship could be really worth it for you, wouldn't you like to get some help for your issues rather than just run from what could be something great?

Counselling could be a great idea for you personally so that you can learn how to communicate properly; bipolar doesn't mean you have a personality that isn't ok for relationships. It is the communication skills which need adjusting.