I need some AI for c++ that makes something fallow my direct path so if I walked in a loop, it would walk in a loop right where I had.

I assume you meant 'following' AI. Fallowing AI would merely have to schedule a year off for each field in your farm every few years, and not plant crops in it that year. Not necessary if you plant legumes on alternate years - this also removes the need for nitrate-based fertilizer.

If you wanted following AI, you merely need to record the last 50 or howevermany positions your character has been in, and place the 'AI' entity on one of those, at an appropriate distance.