No one can guarantee you anything, but harassment is repeated, unwanted contact without any legal basis directly with the aggrieved. Confronting him was a huge mistake, and that could be harassment because it is direct contact with him. Filing a complaint would legally not be deemed harassment, because while it affects him, it is not direct contact with him, but what concerns me is you already have some type of order against you and many times those orders include "indirect contact". You've already made your feelings about this person known. I'm not sure why you want to take it further. These other students are grown adults and if they feel in danger or bullied, they can take their own cause up, you're not their mom. This is college. If this guy is tenured, he ain't going anywhere.
We do not have an attorney-client relationship. I am not your lawyer. The statements I have made do not constitute legal advice. Any statements I have made are based upon the very limited facts you have presented, and under the premise that you will consult with a local attorney. This is not an attempt to solicit business. This disclaimer is in addition to any disclaimers that this website has made. I am only licensed in California.
Something you need to be clear about right away is that "harassment" has two meanings here.
The first is the legal definition for the crime of harassment, which my colleague has laid out. In short: repeated, unwanted, unreasonable contact for no legitimate purpose.
That's not what we're talking about here! What we are talking about is your Student Code of Conduct, which can define "harassment" in almost any way. But an offense under the SCC is *not* the same thing as an offense under Pennsylvania's Criminal Code. The definition of offenses, available defenses, and procedures, are entirely different. Something which is not an offense under the SCC may be a crime. Something which is an offense under the SCC may be entirely legal. There's really no way of telling without reading the SCC in detail, and that's something you'll need to hire a lawyer to do.
As to navigating the university's complaint process, you may consider hiring a lawyer, but you may also find that the university itself has resources available to help students and faculty with that. Consider contacting the ombudsman.
This answer does not constitute legal advice and does not establish an attorney-client relationship.