I've told every girl I've been with the following and they all go forward with the relationship and they all get hurt. I have never meant to hurt any of them but it happens none the less. I don't know what to do anymore. Happiness just seems unattainable to me.

My self-fullfilling prophecy:

You are in pursuit of a dream, and by no means is it a peaceful dream. You fantasize about extraordinary passions, extreme emotions, and romantic insanity. The search for this dream often makes you agitated and restless. You blow through people's lives like a hurricane, leaving a path of shattered hearts and broken promises. You long for stability and commitment, but only the relationship of your dreams will satisfy you. All other relationships are expendable.
If you are lucky enough to find your dream early in life, then you have a wonderful capacity for living happily ever after. If you don't, then the situation can get out of control. Physical sex is always less important to you than emotional security, but your emotional needs are so intense that you often don't take time to notice the difference. Any kind of emotional release--even the most casual or callous--can sustain you for awhile. When your dream seems distant and unattainable, you are all to willing to settle for these short-term fixes.