If a lecturer leers and oggles a student, is he automatically blurring the boundaries?

I mean I had a lecturer in the past year that did this, and sometimes he was mean but in a subtle way/ After all of this, he turns around and takes a self righteous stance as though he was entirely professional and proper in his conduct when he wasn't. Cles full of students saw him oggling me, and other girls. Alone in his office, he would even do that to me. He really confused me. But now, he acts like I am in the wrong? He stepped over the professional boundary in the first place. It is like he is entitled to do whatever he pleases and when called to account immediately denies. Last year, he denied being lecherous when he was blatatn;y staring at girls bottoms, bosoms, etc. etc. in the clroom. I spoke to him at his office and he denied it and also winked at the same time then sent an email stating how he had never been lecherous after having winked at me. What the hell is wrong with a person like that?