yes, it was my mistake. I trusted him because he was my childhood friend and my cousin. He was a tech lead in CMMI Level 5 (serving fortune 500 firms) company at the time he joined with me. I had the trust that he will never ran away with the code and that trust is still there, also the entire feature, roadmap and vision was with me, so I thought code doesn't matter. It was a big learning for me.