Second toe doesn't bend at joint nearest toenail. gave me pain 6 months ago when i would jog on it, pain now only when i try to bend it. what is it?

Many possibilities: Possible cause of your pain may include sprain, bursitis, fracture, contusion, neuritis, but of course there are a multitude of other possibilities. Get the feet inspected by a professional to determine the cause of the problem, as treatment varies depending on the diagnosis.

See a podiatrist: Sounds like an x-ray is in order to check for alignment of the bones in the toe. It is plausible you may have fractured it and it healed in a poor position.